Cita APA

Silverberg, R. 1. (1970). Worlds of maybe: Seven stories of science fiction. New York, New York: T. Nelson.

Citación estilo Chicago

Silverberg, Robert 1935-. Worlds of Maybe: Seven Stories of Science Fiction. New York, New York: T. Nelson, 1970.

Cita MLA

Silverberg, Robert 1935-. Worlds of Maybe: Seven Stories of Science Fiction. New York, New York: T. Nelson, 1970.