Walmsley, D.J., author
Longman, 1993
Buku Teks
Kevin R. Cox and Reginald G. Golledge, editors
Routledge, 2016
Buku Teks
Malinowski, Jon C., author
McGraw-Hill, 2012
Buku Teks
by Jerome D. Fellmann, Mark D. Bjelland, Arthur Getis, Judith Getis
McGraw-Hill, 2010
Buku Teks
Lebon, J. H. G., author
Hutchinson University Library, 1969
Buku Teks