TY  - BOOK
AU  - Bettinghaus,erwin P
TI  - Message preparation: the nature of proof 
PY  - 1966///
CY  - Indianapolic
PB  - Bobbs-Merrill
KW  - Public speaking
KW  - Belief and doubt
KW  - lcsh
N1  - Includes bibliography; Open
ER  -