Macrorie, Ken
Hayden Book Co., 1980
Buku Teks
Moore, Robert Hamilton, author
Holt, Rinehart and Winston, 1959
Buku Teks
Mills, Paul, author
Routledge, 2006
Buku Teks
Dawson, Paul, author
Routledge, 2005
Buku Teks
Smith, Lewis Worthington
Follett Publishing Company, 1930
Buku Teks