by Jerome D. Fellmann, Mark D. Bjelland, Arthur Getis, Judith Getis
McGraw-Hill, 2010
Buku Teks
Malinowski, Jon C.
McGraw-Hill, 2012
Buku Teks
Knapp, Brian
Longman House, 1992
Buku Teks
Huntington, Ellsworth
John Wiley & Sons, 1951
Buku Teks SO
Huntington, Ellsworth
John Wiley & Sons, 1960
Buku Teks SO