James E Davis, colsultan
Graphic Learning,, 1978
Buku Referensi
C. S. Hammond and Company
C.S. Hammond & Co., [date of publication not identified]
Buku Teks
C.S. Hammond , 1961
Buku Referensi
C.S. Hammond & Co. , 1960
Buku Referensi
Chancellor , 2001
Buku Referensi