Spectorsky, A. C. (1956). The book of the sky. Appleton-Century-Crofts.
Cita Chicago Style (17a ed.)Spectorsky, A. C. The Book of the Sky. New York: Appleton-Century-Crofts, 1956.
Cita MLA (9a ed.)Spectorsky, A. C. The Book of the Sky. Appleton-Century-Crofts, 1956.
Precaución: Estas citas no son 100% exactas.