APA

Sagan C., . (2006). The Varieties of Scientific Experience. A Personal View of the Search For God. New York: The Penguin Press.

Chicago

Sagan Carl, . 2006. The Varieties of Scientific Experience. A Personal View of the Search For God. New York: The Penguin Press.

Harvard

Sagan C., . (2006). The Varieties of Scientific Experience. A Personal View of the Search For God. New York: The Penguin Press.

MLA

Sagan Carl, . The Varieties of Scientific Experience. A Personal View of the Search For God. New York: The Penguin Press. 2006.