compiled by Carlos Castillo & Otto F. Bond
The University of Chicago Press, 1948
Buku Referensi
University of Chicago Press, 1993
Buku Teks
Fucilla, Joseph G.
Follett Publishing Company, 1964
Buku Referensi
Vox
McGraw-Hill, 2012
Buku Referensi
Eckersley, C. E. (Charles Ewart), 1892-1967
Longmans, Green and Co., 1953
Buku Referensi