Baliio, Tino, author
Macmillan Library reference USA, 1993
Buku Referensi
edited by John Brook
Doubleday Anchhor, 1975
Buku Teks SO
Schats, Thomas, author
Simon & Schuster Macmilan, 1997
Buku Referensi
Cynthia Lucia, Roy Grundmann, Arthur Simon, editors
Wiley Balckwell, 2016
Buku Teks
Cynthia Lucia, Roy Grundmann and Art Simon, editors
Wiley Balckwell, 2016
Buku Teks