English, Jack
Police training manual / Jack English, Brian English
McGraw-Hill, 1992
 Buku Teks
Univ. of Tennessee
Public health school health safety : bulletin of the Univ. of Tennessee
The health and safety dept., 1973
 Buku Teks
Dean, John J.
Effective speaking here's how / John J. Dean
Boolarong Publications, 1987
 Buku Teks
Munroe, C. J.
The smallholders guide / C. J. Munroe
David & Charles, 1979
 Buku Teks
University of Harvard
Harvard University School of Public Health : Dean's report
University of Harvard, 1973
 Buku Teks