أحمد أمين & Ma'arof, F. (1975). Ethika (ilmu akhlak). Bulan Bintang.
Chicago Style (17th ed.) Citationأحمد أمين and Farid Ma'arof. Ethika (ilmu Akhlak). Jakarta: Bulan Bintang, 1975.
MLA (9th ed.) Citationأحمد أمين and Farid Ma'arof. Ethika (ilmu Akhlak). Bulan Bintang, 1975.
Warning: These citations may not always be 100% accurate.