APA (7th ed.) Citation

Critchfield, D., & Roland, H. (2007). The gilak's guide to Pellucidar. Darel Az Books.

Chicago Style (17th ed.) Citation

Critchfield, David, and Harry Roland. The Gilak's Guide to Pellucidar. [United States?]: Darel Az Books, 2007.

MLA (9th ed.) Citation

Critchfield, David, and Harry Roland. The Gilak's Guide to Pellucidar. Darel Az Books, 2007.