Lindgren, Ernest
Collier Books, 1970
Buku Teks SO
Firman Hadiansyah
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2006
UI - Tesis Membership
edited by Jill Nelmes
Routledge, 1996
Buku Teks SO
Bettetini, Gianfranco
Mouton, 1973
Buku Teks SO
Burch, Noel
Praeger 1, 1973
Buku Teks SO