Gaya APA

Etika (ilmu akhlak). (1975). : .

Gaya Chicago

Etika (ilmu akhlak). . : , 1975. Textbook.

Gaya MLA

Etika (ilmu akhlak). . : , 1975. Textbook.

Gaya Turabian

Etika (ilmu akhlak). : , 1975. Textbook.