Rees, Leslie, 1905-2000, author
Angus and Roberson, 1973
Buku Teks
Jon R. Conte, editor
Sage Publications, 2002
Buku Teks
Hegeland, Hugo, author
Elanders Boktryckeri Aktiebolag, 1951
Buku Teks
Gomm, Roger, author
Palgrave McMillan, 2004
Buku Teks
edited by Ana MarĂa Munar, Tazim Jamal
Emerald, 2016
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