Gaya APA

Davids, G, C, 1, R, C, A, F, R, (, A. (2016). ELEMENTS OF GENERAL PHILOSOPHY . : Wentworth Press.

Gaya MLA

Davids, George, Croom, 1842-1892, Robertson;, Caroline, A., F., Rhys, (Caroline, Au. "ELEMENTS OF GENERAL PHILOSOPHY". : Wentworth Press, 2016. Text.