Cita APA (7a ed.)

Smart, W. M. 1. a. (1958). Combination of observations. University Press.

Cita Chicago Style (17a ed.)

Smart, W. M. 1889- autor. Combination of Observations. Cambridge: University Press, 1958.

Cita MLA (9a ed.)

Smart, W. M. 1889- autor. Combination of Observations. University Press, 1958.