Dyfyniad APA

FAO. (1980). Echo sounding and sonar for fishing. Fishing News Books.

Dyfyniad Arddull Chicago

FAO. Echo Sounding and Sonar for Fishing. England: Fishing News Books, 1980.

Dyfyniad MLA

FAO. Echo Sounding and Sonar for Fishing. Fishing News Books, 1980.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.