APA استشهاد

Zelko, H. P. (1969). Business conference: Leadership and participation. McGraw-Hill.

استشهاد بنمط شيكاغو

Zelko, Harold P. Business Conference: Leadership and Participation. New York: McGraw-Hill, 1969.

MLA استشهاد

Zelko, Harold P. Business Conference: Leadership and Participation. McGraw-Hill, 1969.