Oppenheim, L., author
Longmas, Green , 1961
Buku Teks
Underhill, H.C. (Harry Clay), 1858-1918, author
Bobbs-Merrill , [19--?]
Buku Klasik
Lyall, Francis, author
Routledge, 2018
Buku Teks
E. Sumaryono, author
Kanisius, 2002
Buku Teks
Robert Maynard Hutchins, editor in chief
Encyclopaedia Britannica, Inc., 1952
Buku Referensi