APA (7th ed.) Citation

Wockel, M., & Schellmann, H. W. E. Who's who in (European) commerce and industry (3. ed.). IBP.

Chicago Style (17th ed.) Citation

Wockel, Manfred, and Hans-Joachim W. E. Schellmann. Who's Who in (European) Commerce and Industry. 3. ed. Berlin u.a: IBP.

MLA (9th ed.) Citation

Wockel, Manfred, and Hans-Joachim W. E. Schellmann. Who's Who in (European) Commerce and Industry. 3. ed. IBP.