Hard science fiction
MLA
Slusser, George Edgar, and Eric S Rabkin. Hard Science Fiction. Carbondale: Southern Illinois University Press, 1986
APA, 7th edition
Slusser, G. Edgar, & Rabkin, E. S. (1986). Hard science fiction. Carbondale: Southern Illinois University Press
Chicago, 17th edition
Slusser, George Edgar., and Eric S Rabkin. Hard science fiction. Carbondale: Southern Illinois University Press, 1986