Artikel Jurnal
Reynolds, Paul Davidson
Prentice-Hall, 1982
Buku Teks SO
Misumi, Jyuji
University of Michigan Press, 1985.
Buku Teks SO
Oey-Gardiner, Mayling
Yayasan Pustaka Obor Indonesia, 2021
Buku Teks SO
Andrew I. Cohen: Christopher Health Well,am
Blackwell, 2005
Buku Teks SO