Gregory, Robert Henry, author
Chatto and Windus, 1963
Buku Teks
Awad, Elias M., author
Prentice-Hall, 1971
Buku Teks
Thierauf, Robert J., author
John Wiley & Sons, 1980
Buku Teks
Orilla, Lawrence S., author
McGraw-Hill Int.Book, 1983
Buku Teks
Orilia, Lawrence S., author
McGraw-Hill, 1982
Buku Teks