Turner, Lynn H., author
Cambridge University Press, 2019
Buku Teks
Oxford Unity Press,
Majalah, Jurnal, Buletin
Gamble, Teri Kwal, author
McGraw-Hill, 2005
Buku Teks
edited by Yahya R. Kamalipour
Thomson, Wadsworth, 2007
Buku Teks
Leach, Edmund Ronald, editor
Cambridge University Press, 1976
Buku Teks