Sailing directions (enroute) :
East Africa and the South Indian Ocean /
prepared and published by the National Imagery and Mapping Agency.

APA Citation

United States. National Imagery and Mapping Agency. (2001). Sailing directions (enroute): East Africa and the South Indian Ocean. 7th ed. Bethesda, Md.: The Agency .

MLA Citation

United States. National Imagery and Mapping Agency. Sailing Directions (enroute): East Africa And the South Indian Ocean. 7th ed. Bethesda, Md.: The Agency , 2001.

Warning: These citations may not always be complete (especially for serials).