APA Citation

Blake, B., & Blake, B. (1991). The new key to Costa Rica (10. edition --.). San José, C.R.: Publications in English.

Chicago Style Citation

Blake, Beatrice, and Beatrice Blake. The New Key to Costa Rica. 10. edition --. San José, C.R.: Publications in English, 1991.

MLA Citation

Blake, Beatrice, and Beatrice Blake. The New Key to Costa Rica. 10. edition --. San José, C.R.: Publications in English, 1991.

Warning: These citations may not always be 100% accurate.