APA (7th ed.) Citation

Calvo Beca, R., & SUPANICH, G. P. (1985). Commercial english: An autodidactic program. Cultural.

Chicago Style (17th ed.) Citation

Calvo Beca, Rafael, and Gary P. SUPANICH. Commercial English: An Autodidactic Program. Madrid: Cultural, 1985.

MLA (9th ed.) Citation

Calvo Beca, Rafael, and Gary P. SUPANICH. Commercial English: An Autodidactic Program. Cultural, 1985.