2 literature references:

Author: FAO-FIES
Year: 2009
Title: Aquatic Sciences and Fisheries Information System (ASFIS) species list.
Source: Retrieved from http://www.fao.org/fishery/collection/asfis/en, August 2009.
Author: Nakamura, I.
Year: 1985
Title: FAO Species Catalogue. Vol. 5. Billfishes of the world. An annotated and illustrated catalogue of marlins, sailfishes, spearfishes and swordfishes known to date.
Source: FAO Fish. Synop. 125(5):65 p.