Collier's encyclopedia, with bibliography and index; Volume 4
P.F. Collier & Son, 1954
 Buku Referensi
Collier's encyclopedia, with bibliography and index; Volume 3
P.F. Collier & Son, 1954
 Buku Referensi
Collier's encyclopedia, with bibliography and index; Volume 5
P.F. Collier & Son, 1954
 Buku Referensi
Collier's encyclopedia, with bibliography and index; Volume 6
P.F. Collier & Son, 1954
 Buku Referensi
Collier's encyclopedia, with bibliography and index; Volume 8
P.F. Collier & Son, 1954
 Buku Referensi