Hogan, Rex, 1944-
Prentice-Hall, 1990
Buku Teks SO
Church, James C.
McGraw-Hill, 1979
Buku Referensi
edited by Lise Ostergaard
Routledge, 1992
Buku Teks SO
edited by Andrea Wigbels Stewart, Carlette Washington-Hoagland, Carol T. Zsulya
Illinois ALA Editions, 2013
Buku Teks SO
Sophie Laws, Caroline Harper, Nicola JOnes, Rachel Marcus
SAGE, 2013
Buku Teks