Gaya APA
Bittel, L, R., Ramsey, J, E. (1989).
ENCYCLOPEDIA OF PROFESSIONAL MANAGEMENT, Second Edition (Volume 1).
USA:
mcgraw hill.
Gaya MLA
Bittel, Lester, Robert., Ramsey, Jackson, Eugene.
"ENCYCLOPEDIA OF PROFESSIONAL MANAGEMENT, Second Edition".
Volume 1
USA:
mcgraw hill,
1989.
Text.