Cita APA

Etchemendy, N., & Etchemendy, N. (1980). The watchers of space. New York, New York: Avon Books.

Citación estilo Chicago

Etchemendy, Nancy, y Nancy Etchemendy. The Watchers of Space. New York, New York: Avon Books, 1980.

Cita MLA

Etchemendy, Nancy, y Nancy Etchemendy. The Watchers of Space. New York, New York: Avon Books, 1980.