Charles W. Eliot, edited
Grolier Enterprises Corp., 1995
Buku Referensi
P. F. Collier & Son Corporation, 1959 ; 1969
Buku Teks
P. F. Collier & Son Corporation, 1959 ; 1969
Buku Referensi
P. F. Collier & Son Corporation, 1959 ; 1969
Buku Referensi
Grolier Enterprises Corp., 1995
Buku Teks