Robert M. Hutchins, Mortimer J. Adler, editors in chief
Encyclopaedia Britannica, Inc., 1963
Buku Referensi
Charles W. Eliot, edited
P. F. Collier & Son Corporation, 1959
Buku Referensi
Damanik, Erfadila Pranata, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2014
UI - Skripsi (Membership)
Robert M. Hutchins, Mortimer J. Adler, editors in chief
Encyclopaedia Britannica, Inc., 1963
Buku Referensi
Trilling, Lionel, author
Viking Press, 1951
Buku Teks