Artikel Jurnal
Carsrud, Alan L.
Springer, 2011
eBooks
Kesselman, Mark
D.C. Health an Company, 1987
Buku Teks
Agil Kurniadi
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2018
UI - Tesis Membership
edited by Bernard S. Silberman and H.D. Harootunian with ten collaborating authors
University of Arizona Press, 1966
Buku Teks SO