De-Nóbrega, JR, and E Villamizar. “Sexual Ratio in Populations of Sparisoma Radians and Sparisoma Atomarium at Los Roques Archipelago, Venezuela: An Evolutionary Approach”. Ciencias Marinas, vol. 30, no. 1B, Mar. 2004, pp. 251-8, doi:10.7773/cm.v30i12.103.