Sass, John E.
Iowa State University Press, 1994
Buku Teks
Berlyn, Graeme P.
Iowa State University Press, 1976
Buku Teks
Francon, M.
Row, Peterson, 1961
Buku Teks
edited by D.B. Holt ... [et al.]
Academic Press, 1974
Buku Teks
Meek, Geoffrey A.
John Wiley & Sons, 976
Buku Teks