Shera, Jesse H.
Becker and Hayes, 1972
Buku Referensi
Shera, Jesse H.
Archon Books, 1965
Buku Referensi
Rungkat, Thelma, author
ANCORA Press , 1997
Buku Teks
The University of Chicago Press , 1965
Buku Teks
editor, E. Dale Cluff
The Haworth Press , 1990
Buku Teks