Παραπομπή APA

Smith, P. I. S. (1970). Industrial intelligence and espionage. Business Books.

Παραπομπή Chicago Style

Smith, Paul I. Slee. Industrial Intelligence and Espionage. London: Business Books, 1970.

Παραπομπή MLA

Smith, Paul I. Slee. Industrial Intelligence and Espionage. Business Books, 1970.