Fenna, Donald
Oxford University Press, 2003
Buku Referensi
edited by Rebecca B. Rubin, Philip Palmgreen and Howard E. Sypher
Lawrence Erlbaum Associates, 2004
Buku Teks
edited by Terri D. Fisher ... [and others]
Routledge, 2011
Buku Teks
McGrow Hill Book , 1981
Buku Teks
edited by John L. Sheppard
Camberland Collegge of Health, 1984
Buku Teks