About Calling Card Books

& Z Girls Press

Clyde: The Cat That Came In From the Cold

Our Mission and Vision

MKZ Books, Inc. is an Independent publisher developing books that educate, inspire, and inform. Our non-fiction imprint Calling Card Books publishes experts in their field or people whose stories will inspire others.  Our Vision is that Calling Card’s books make a difference in the lives of those who read them.

Z Girls Press, our fiction imprint, publishes books that will inspire and delight readers. Our Vision is that Z Girls Press books are so engaging that readers will enjoy them again and again.

Perdisco Press is an academic imprint established to bring books and a related learning platform to support educators in their mission to educate. Our Vision is that Perdisco Press books, written by educators for use in their classrooms, will benefit students through easy access to the educator, their lessons, and additional instructional content.

Our intake process selects authors committed to their chosen field or have magical imaginations that take us away or mastery of a subject that brings joy to their students. MKZ Books’ three imprints are passionate about bringing these talented authors’ work to the reading public.

Marta Zarrella


During her “late-in-life” career as an award winning Freelance Writer and Journalist, Marta wrote for newspapers and magazines, did web and marketing content, as well as writing and editing training material for small businesses and non-profits.  Calling Card Books was born as an imprint to publish business books, but demand grew and so did the imprint.  We now publish memoirs and other non-fiction that fit our Mission and Vision. 

Z Girls Press was born from Marta’s lifelong dream of writing a children’s book. Though that has yet to happen, we have published a few beloved children’s, middle-grade, young adult, and adult fiction titles including our Creative Director’s own coloring book series, Color Lit.

Kate Zarrella

Creative Director

Kate Zarrella is a 2012 University of California Davis double honors graduate in English and Psychology. She interned at Reaktion Books, a non-fiction publisher in London, England.

Now she’s joined the team at Calling Card Books as the Creative Director. She specializes in book design, cover design, web design and e-book conversion. She as also illustrated two literary themed coloring books, A Quick Succession of Busy Nothings and Color The Bard.

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Why shop Indie?

    The Community

    • Local retailers are your friends and neighbors—support them and they’ll support you.
    • Local businesses donate to charities at more than twice the rate of national chains.
    • More independents means more choice, more diversity, and a truly unique community.

    The Environment

    • Buying local means less packaging, less transportation, and a smaller carbon footprint.
    • Shopping in a local business district means less infrastructure, less maintenance, and more money to beautify your community. 

    The Economy

    • Of $100 spent at a local-owned business $52 of that stays in your community.
    • Spend $50 at a national chain and $6.50 stays in the local community.
    • Spend $50 online with a remote vendor with no sales tax collected and not one penny stays in your local community.

    The bottom line is that more of your taxes are reinvested in your community⁠—where they belong.

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