Dyfyniad APA

RYAN, J. (1960). Learning to swim is fun. The Ronald Press.

Dyfyniad Arddull Chicago

RYAN, Jack. Learning to Swim Is Fun. New York: The Ronald Press, 1960.

Dyfyniad MLA

RYAN, Jack. Learning to Swim Is Fun. The Ronald Press, 1960.

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