APA (7th ed.) Citation

Elster, R. J. (1987). Trade shows and professional exhibits directory (2nd ed.). Gale.

Chicago Style (17th ed.) Citation

Elster, Robert J. Trade Shows and Professional Exhibits Directory. 2nd ed. Detroit, Mich: Gale, 1987.

MLA (9th ed.) Citation

Elster, Robert J. Trade Shows and Professional Exhibits Directory. 2nd ed. Gale, 1987.