Greyser, Stephen A.
Prentice-Hall, 1972
Buku Teks
Kokoska, Stephen
Springer-Verlag, 1989
Buku Teks
Gray, Stephen E.
MacMillan Press , 1978
Buku Teks
Robbins, Stephen P., author
Prentice-Hall, 1988
Buku Teks
Wasby, Stephen L.
Charles Scribner`s Sons, 1973
Buku Teks