Dowden, Ken, author
Routlegde, 2000
Buku Teks
Robert Maynard Hutchins, editor in chief
Encyclopaedia Britannica, Inc., 1952
Buku Referensi
Ade Nurrahmah Badriya Fitri, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2013
UI - Skripsi (Membership)
Berckmans, J.M.H.
Dedalus, 1991
Buku Teks
Susan M. Felch, editor
Cambridge University Press, 2018
Buku Teks