Murdock, George Peter, author
McGraw-Hill, 1959
Buku Teks
Nielsen, Waldemar A., author
Atheneum, 1966
Buku Teks
edited by Phillis M. Martin and Patrick O'Meara
Indiana University Press, 1995
Buku Teks
Gilbert, Erik, author
Pearson Educational, 2004
Buku Teks
edited by Kate Darian-Smith, Liz Gunner and Sarah Nuttall
Routledge , 1996
Buku Teks