Paul Edwards, editor in chief
Macmilan , 1972
Buku Referensi
editor in chief, Paul Edwards
Macmilan , 1972
Buku Referensi
edited by David L. Sills
Macmillan and The Free Press, 1968
Buku Referensi
Americana Corporation, 1977
Buku Referensi
Americana Corporation, 1964
Buku Referensi