Freund, John E., author
Prentice-Hall, 1984
Buku Teks
Bowley, Arthur, author
Macdonald and Evans, 1951
Buku Teks
Levin, Richard I., author
Prentice-Hall, 1980
Buku Teks
Hoel, Paul Gerhard, 1905-, author
John Wiley & Sons, 1962
Buku Teks SO
Ullman, Neil R., author
John Wiley & Sons, 1978
Buku Teks