Blake, B., & Becher, A. (1991). The new key to Costa Rica (10. ed., ampl. y actualizada.). San José, C.R.: Publications in English.
Chicago Style CitationBlake, Beatrice, and Anne Becher. The New Key to Costa Rica. 10. ed., ampl. y actualizada. San José, C.R.: Publications in English, 1991.
MLA CitationBlake, Beatrice, and Anne Becher. The New Key to Costa Rica. 10. ed., ampl. y actualizada. San José, C.R.: Publications in English, 1991.
Warning: These citations may not always be 100% accurate.