APA (7th ed.) Citation

Silverberg, R. (2001). Science fiction 101: Robert Silverberg's worlds of wonder. Ibooks.

Chicago Style (17th ed.) Citation

Silverberg, Robert. Science Fiction 101: Robert Silverberg's Worlds of Wonder. New York, NY: Ibooks, 2001.

MLA (8th ed.) Citation

Silverberg, Robert. Science Fiction 101: Robert Silverberg's Worlds of Wonder. Ibooks, 2001.

Warning: These citations may not always be 100% accurate.