Cita APA (7th ed.)

Boynton, G. (1987). Guide to the business cities of the world. Perry Books.

Cita Chicago (17th ed.)

Boynton, Graham. Guide to the Business Cities of the World. Londres: Perry Books, 1987.

Cita MLA (9th ed.)

Boynton, Graham. Guide to the Business Cities of the World. Perry Books, 1987.