Bollens, John C.
Harper and Row, 1975
Buku Teks
Bollens, John C.
Harper and Row, 1970
Buku Teks
University of California Press , 1959
Buku Teks
edited by Leonard J. Duhl, with the assistance of John Powell
Basic Books, 1963
Buku Teks
edited by: John Halligan and Chris Paris
Longman Chesire, 1984
Buku Teks