edited by Catherine Spellman
Actar, 2003
Buku Teks
BooQs publisher data, 2010
Buku Referensi
edited by Steven Moorhead and Gordon Grice
Rockport Publisher, 1997
Buku Referensi
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Routledge, 2012
Buku Teks
Simonds, John Ormsbee, author
McGraw-Hill, 1961
Buku Teks