Gaya APA
Bittel, L, R., Bittel, M, A. (1978).
Encyclopedia of professional management (Volume 2).
United States:
McGraw-Hill.
Gaya MLA
Bittel, Lester, Robert., Bittel, Muriel, Albers.
"Encyclopedia of professional management".
Volume 2
United States:
McGraw-Hill,
1978.
Text.