edited by Howard Newby
John Wiley & Sons, 1978
Buku Teks
edited by George J. Halasi-ku
Pergamon Press, 1984
Buku Teks
Blalock, Hubert M., author
Academic Press, 1975
Buku Teks
Thompson, Kenneth W., author
Lousiana State University Press, 1980
Buku Teks
Lewis, William Arthur, 1915-, author
Princeton University Press, 1978
Buku Teks