Rose, Peter I., foreword
Random House, 1964
Buku Teks
Schaefer, Richard T
Pearson Education, 2015
Buku Teks
Eljinah Anderson, editor ; Dougkas S. Massey, editor
Ruseel sage foundation, 2001
Buku Teks
Pasaribu, Ruth Vania Christine
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2014
UI - Skripsi (Membership)
edited by Edgar T. Thompson, Robert E. Park
Duke University Press, 1939
Buku Teks