Gwyn, Richard
McClelland and Stewart, 1980
Buku Teks
Cronin, Blaise
Taylor Graham and Contributors, 1991
Buku Teks SO
editors, Robert Sembiring, Kees Hoogland, Maarten Dolk
Utrecht, 2010
Buku Teks SO
Haveman, Robert H.
Academic Press, 1977
Buku Teks
Harrington, Michael
Simon and Schuster, 1980
Buku Teks SO