Larousse illustrated international encyclopedia
Larousse , 1972
Buku Referensi
McWhirter, Norris
Dunlop illustrated encyclopedia of facts / compiled by Norris and Ross McWhirter
Doubleday, 1969
Buku Referensi
The Nuttall encyclopaedia / edited by C. M. Prior
Frederick Warne , 1956
Buku Referensi
Pears cyclopedia
editor L. Mary Barker
A & F Pears , 1949
Buku Referensi
The Columbia encyclopedia
Columbia University Press, 1950
Buku Referensi
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