Lilawati Kurnia
Pustaka Obor Indonesia, 2015
Buku Teks SO
Orum, Anthony M.
Blackwell, 2003
Buku Teks SO
Maier, Henry W
Random House, 1966
Buku Teks SO
edited by Andrew Blowers, Chris Hammett and Philip Sarre
Hutchinson Educational in association with the Open University Press, 1974
Buku Teks SO
Gutkind, E.A.
Free Press of Glencoe, 1963
Buku Teks SO