Trecker, Harleigh B., author
Association Press, 1967
Buku Teks
Konopka, Gisela, author
Prentice-Hall, 1963
Buku Teks
Batten,T.R., author
Oxford University Press, 1978
Buku Teks
Miles, Matthew B., author
Teachers College Press, 1973
Buku Teks
Thibaut, John W., author
John Wiley and Sons, 1967
Buku Teks