MLA

of Manuscripts, Yale University. Department, and Archives. Book VIII Print 73: Congress of the Federación Nacional De Trabajadores Del Azucar in Havana. 1959. https://collections.library.yale.edu/catalog/10018685.

APA, 6th edition

of Manuscripts, Y. U. D., & A. (1959). Book VIII Print 73: Congress of the Federación Nacional de Trabajadores del Azucar in Havana. https://collections.library.yale.edu/catalog/10018685.