Eichner, Bill, author
Chelsea Green Publishing Company, 2001
Buku Teks
Reid, Ian, 1943-, author
Routledge, 1994
Buku Teks
Robinson, Andrew, author
Thames & Hudson, 2007
Buku Teks
Wilder
Gramedia, 1956
Buku Teks
Harlow, Ralph Volney, author
Holt, Rinehart and Winston,Inc, 1964
Buku Teks