edited by Di Lewis
Queensland University of Technology, 1999
Buku Teks
Bogg, Daisy
McGraw-Hill, 2012
Buku Teks
Sklare, Arnold B.
McGraw-Hill, 1964
Buku Teks
Waldo, Willis H.
Van Nostrand Reinhold, 1960
Koleksi Publik
Lesikar, Raymond Vincent
Irwin, 1995
Buku Teks