MLA

Horrie, Chris, and Peter Chippindale. What Is Islam?: A Comprehensive Introduction. 4th edition (revised and updated) London: Virgin books, 2007.

APA

Horrie, C., & Chippindale, P. (2007). What is Islam?: A Comprehensive Introduction. 4th edition (revised and updated) London: Virgin books.

Chicago

Horrie, Chris, and Peter Chippindale. What Is Islam?: A Comprehensive Introduction. 4th edition (revised and updated) London: Virgin books, 2007.