Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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