Cheeseman, G.W.H., author
John Wiley & Sons, 1979
Buku Teks
Haynes, Williams, author
D. Van Nostrand, 1959
Buku Referensi
The Reader's Digest Association, 1953
Buku Teks
The Reader's Digest Association, 1953
Buku Teks
The Reader's Digest Association, 1955
Buku Teks