Gaya APA

Ryser, O, E., R., I, B, J. (1983). A manual for seventh edition tumbling and apparatus stunts . Iowa: Iowa: WCB; 1983.

Gaya MLA

Ryser, Otto, E.., R., I., Brown,, James. "A manual for seventh edition tumbling and apparatus stunts". Iowa: Iowa: WCB; 1983, 1983. Text.