Berry, Dianne, author
Open University Press, 2007
Buku Teks
edited by Don W. Stack, Michael B. Salwen
Routledge, Taylor & Francis Group, 2009
Buku Teks
Hovland, Carl.I
Yale University Press, 1964
Buku Teks
Anmol Publications PVT, 2001
Buku Teks
Yuliana, author
Grasindo, 2002
Buku Teks