Duddington, C. L. (1971). Beginner's guide to seaweeds. Pelham Books.
Dyfyniad Arddull ChicagoDuddington, C. L. Beginner's Guide to Seaweeds. Pelham Books, 1971.
Dyfyniad MLADuddington, C. L. Beginner's Guide to Seaweeds. Pelham Books, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.