Gaya APA
Jeffries, J, R. (1991).
The Executive Guide to Meetings, Conferences, & Audiovisual Presentations .
USA:
McGraw-Hill.
Gaya MLA
Jeffries, James, R..
"The Executive Guide to Meetings, Conferences, & Audiovisual Presentations".
USA:
McGraw-Hill,
1991.
Teksbook.