Wing, Omar, author
Holt, Rinehart and Winston, 1972
Buku Teks
Adby, P.R., author
John Wiley & Sons, 1980
Buku Teks
Director, Stephen W., 1943-, author
John Wiley & Sons, 1975
Buku Teks
Lago, Gladwyn V.
John Wiley & Sons, 1979
Buku Teks
Riches, B.E.
ESM, 1989
Buku Teks