A wide variety of resources are available to learn more about the history of the depiction of California as an island.  

Resources by Glen McLauglin

The Mapping of California as an Island: An Illustrated Checklist. California Map Society, 1995. 

References cited in The Mapping of California as an Island

California as an Island: Maps from the Library, University of California, Berkeley, Keepsake No. 54, 2009.

Other Publications

California as an Island by John Leighly. Book Club of California, 1972.

California as an Island: A Geographical Misconception Illustrated by 100 Examples from 1625-1770 by Ronald V. Tooley. Map Collectors' Circle, 1964.

The Island of California: a History of the Myth by Dora Beale Polke. University of Nebraska Press, 1995.

"Pocket Map: California as an island" in On the Map by Simon Garfield. Gotham Books, 2013.

Press Information

California as an Island in BOOM: A Journal of California by Rebecca Solnit. Spring 2014.

Collection of North America maps from back when California was an island are now online by Xeni Jardin on September 13, 2013.

When mapmakers thought California was an island by Rachael Myrow on The California Report, KQED. April 1, 2013.

When California was an island by Rachael Myrow on KQED News Fix. April 1, 2013.

A collection that identifies California as a world apart by Larry Gordon in the Los Angeles Times. December 16, 2012.

We have pirates! by Ravali Reddy on the Peninsula Report. September 21, 2102.

People used to think California was an island by Jennifer Walsh from the Business Insider. September 4, 2012.

Largest private map collection of "California as Island" comes to Stanford by Cynthia Haven from the Stanford Report. August 30, 2012.