Repka, Joe
Wm. C. Brown Publishers, 1994
Buku Teks
Siddons, A.W., author
Cambridge University Press, 1963
Buku Teks
Simmons, George F.
McGraw-HIll, 1996
Buku Teks
Simmons, George F.
McgRaw-Hill, 1985
Buku Teks
Ellis, Robert
Harcourt Brace Javanovich, 1978
Buku Teks