Gleason, Henry Allan
Holt, Rinehard, 1963
Buku Teks
Tomalin, Marcus, author
Cambridge University Press, 2006
Buku Teks
Post-Graduate Centre, 1975
Buku Teks
Demers, Richard A.
MIT Press, 1991
Buku Teks
Salverda, Reinier, author
I.C.G. Printing, 1985
Buku Teks