Lilly, J. Robert
Sage Publications, 1995
Buku Teks
Jacobs, Sydney
LBC Information Service, 2000
Buku Teks
Bix, Brian H.
Sweet & Maxwell, 1999
Buku Teks
Reardon, Kathleen Kelley
Beverly Hills, 1981
Buku Teks
by Thomas A. Kindermann and Jaan Valsiner
New Jersey, 1995
Buku Teks