LeoGrande, William M. (2014). Back channel to Cuba : the hidden history of negotiations between Washington and Havana. Peter Kornbluh. Chapel Hill. pp. 269–271. ISBN978-1-4696-1763-3. OCLC875742399.{{cite book}}: CS1 maint: location missing publisher (link)
Salim, Lamrani (2013). The economic war against Cuba a historical and legal perspective on the US blockade. Monthly Review Press. p. 32. ISBN978-1-58367-341-6. OCLC931022681.