Colby, Elbridge (January 1922). “The United States and the Coto Dispute between Panama and Costa Rica”. The Journal of International Relations12 (3): 372–378. doi:10.2307/29738499. JSTOR29738499.
Colby, Elbridge (January 1922). “The United States and the Coto Dispute between Panama and Costa Rica”. The Journal of International Relations12 (3): 372–378. doi:10.2307/29738499. JSTOR29738499.