C.S. Hammond & Co. , 1960
Buku Referensi
Garden City Books, [Date of publication not identified]
Buku Referensi
C. S. Hammond and Company
C.S. Hammond & Co., [Date of publication not identified]
Buku Teks SO
C.S. Hammond , 1961
Buku Referensi
edited by Martin Kilson
Harvard University Press, 1975
Buku Teks SO