Cohen, Bruce J., author
McGraw-Hill, 1988
Buku Teks
Toennies, Ferdinand
The University of Chicago Press, 1971
Buku Teks
Artikel Jurnal
Martindale, Don, author
Hougton Mifflin, 1966
Buku Teks
Escapit, Robert, author
Yayasan Pustaka Obor Indonesia, 2017
Buku Teks