Faller, Kathleen Coulborn
Columbia University Press, 1988
Buku Referensi
edited by Freddy A. Paniagua, Ann-Marie Yamada
Academic Press, 2013
eBooks
edited by Jennifer M. Brown and Sandra L. Walklate
Routledge, 2012
Buku Teks
Sage Publications, 1988
Buku Teks
edited by Gail Elizabeth Wyatt, Gloria Johnson Powell
Sage Publications, 1988
Buku Teks SO