Knapp, Brian J., author
Longman, 1992
Buku Teks
Getis, Arthur, author
Macmillan, 1985
Buku Teks
Walmsley, D.J., author
Longman, 1993
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