Collier's encyclopedia, with bibliography and index; Volume 14
P.F. Collier & Son, 1954
Buku Referensi
Collier's encyclopedia : volume 21
Macmillan Educational Company, 1990
Buku Referensi
Collier's encyclopedia : volume 22
Macmillan Educational Company, 1990
Buku Referensi
Collier's encyclopedia : volume 23
Macmillan Educational Company, 1990
Buku Referensi
Collier's encyclopedia : volume 24
Macmillan Educational Company, 1990
Buku Referensi