Gaya APA

Stumpf, S, E. (1983). Philosophical problems : selected reading in ethics religion political philosophy epistemology and metaphysics (2nd ed). Singapore: McGraw-Hill.

Gaya MLA

Stumpf, Samuel, Enoch. "Philosophical problems : selected reading in ethics religion political philosophy epistemology and metaphysics". 2nd ed Singapore: McGraw-Hill, 1983. Text.