Encyclopedia of earth sciences : volume 1
E. Julius Dasch, editor in chief
MacMillan Reference USA, 1996
 Buku Referensi
Walford's guide to reference material : sixth edition, volume 2, social & historical sciences, philosophy & religion
Library Association Publishing, 1994
 Buku Referensi
Walford`s guide to reference material : fourth edition, volume 2, social & historical sciences, philosophy & religion
Library Association, 1982
 Buku Referensi
The encyclopedia of philosophy volume 7 and 8
Paul Edwards, editor in chief
Macmilan , 1972
 Buku Referensi
The encyclopedia of philosophy; volume 7 and 8
editor in chief, Paul Edwards
Macmilan , 1972
 Buku Referensi
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