Longman, 1992
Buku Referensi
Hava, J.G., author
Catholic Press , 1951
Buku Referensi
Simon, W., author
Lund Humphries & Co, 1947
Buku Referensi
Mawson, C. O. Sylvester, author
Garden City Publishing Company, 1940
Buku Referensi
William Allan Neilson, editor in chief; Thomas A. Knott, general editor; Paul W. Carhart, managing editor
Springfield, G & C Merriam Co.
Buku Referensi