Cita APA

Weil, T. E., & Weil, T. E. (1973). Area handbook for Ecuador (1. edition.). Washington: U.S. Government Printing Office.

Citación estilo Chicago

Weil, Thomas E., y Thomas E. Weil. Area Handbook for Ecuador. 1. edition. Washington: U.S. Government Printing Office, 1973.

Cita MLA

Weil, Thomas E., y Thomas E. Weil. Area Handbook for Ecuador. 1. edition. Washington: U.S. Government Printing Office, 1973.