Encyclopaedia of the social sciences : volumes 1-2
editor in chief Edwin R. A. Seligman
MacMilan Company, 1953
 Buku Referensi
Encyclopaedia of the social sciences : volumes 3-4
editor in chief Edwin R. A. Seligman
MacMilan Company, 1953
 Buku Referensi
Encyclopaedia of the social sciences : volumes 5-6
editor in chief Edwin R. A. Seligman
MacMilan Company, 1953
 Buku Referensi
Encyclopaedia of the social sciences : volumes 7-8
editor in chief Edwin R. A. Seligman
MacMilan Company, 1953
 Buku Referensi
Encyclopaedia of the social sciences : volumes 9-10
editor in chief Edwin R. A. Seligman
MacMilan Company, 1953
 Buku Referensi