Schlesinger, Arthur Meier, author
Pustaka Sinar Harapan, 1997
Buku Teks
Grande, Sandy, 1964-, author
Rowman and Littlefield, 2015
Buku Teks
Powell, Robert G., author
Lawrence Erlbaum Associates, 2004
Buku Teks
Cleveland, Harlan, author
McGraw-Hill, 1960
Buku Teks
Ferguson, Gibson, author
Edinburgh University Press, 2006
Buku Teks