Citazione Stile APA (7a Edizione)

Farmer, P. J. (1977). Time's last gift (Revised ed. 1 print.). Ballantine Books.

Citazione stile Chigago Style (17a edizione)

Farmer, Philip José. Time's Last Gift. Revised ed. 1 print. New York: Ballantine Books, 1977.

Citatione MLA (9a ed.)

Farmer, Philip José. Time's Last Gift. Revised ed. 1 print. Ballantine Books, 1977.