Rouse, Hunter
John Wiley & Sons, 1946
Buku Teks
Rouse, Hunter
Wiley Eastern Private, 1946
Buku Teks
Trefil, J.S., author
Pergamon Press, 1975
Buku Teks
Burke, Shirley R., author
Mosby , 1980
Buku Teks
Universiti Teknologi Malaysia, 2008
Buku Referensi