Wiedmann, Clark, author
Petrocelli Books, 1974
Buku Referensi
LePage, Wilbur R., author
Prentice-Hall, 1978
Buku Teks
Harms, Edward, author
John Wiley & Sons, 1977
Buku Teks
Paulman, Jack, author
Win C. Brown, 1976
Buku Teks
John Wiley & Sons, 1980
Buku Teks