Cita APA

Shapley, H. 1. (1969). Source book in astronomy, 1900-1950. Cambridge, Mass.: Harvard University Press.

Citación estilo Chicago

Shapley, Harlow 1885-1972. Source Book in Astronomy, 1900-1950. Cambridge, Mass.: Harvard University Press, 1969.

Cita MLA

Shapley, Harlow 1885-1972. Source Book in Astronomy, 1900-1950. Cambridge, Mass.: Harvard University Press, 1969.