Rosenberg, R. Robert
Greg and Comm, 1975
Buku Teks
Pintel, Gerald
Prentice-Hall, 1989
Buku Teks
Meier, Robert C.
McGraw-Hill, 1960
Buku Teks
Boiselle, Arthur H.
Addison-Wesley, 1981
Buku Teks
Kaliski, Burton S.
Harcourt Brace Jovanovich, 1982
Buku Teks