APA

Sheffield L., Sheffield N. c., .Swimming simplified revised and enlarged edition / by Lyba and Nita Sheffield, A. M. directors of swimming at the Universities of California and Columbia (summer sessions), and (nita sheffield) instructor of physical education, tachers college. New York : A. S. Barnes and company, 1929: .

Chicago

Sheffield Lyba, Sheffield Nitta coaut, .Swimming simplified revised and enlarged edition / by Lyba and Nita Sheffield, A. M. directors of swimming at the Universities of California and Columbia (summer sessions), and (nita sheffield) instructor of physical education, tachers college. New York : A. S. Barnes and company, 1929: .

Harvard

Sheffield L., Sheffield N. c., .Swimming simplified revised and enlarged edition / by Lyba and Nita Sheffield, A. M. directors of swimming at the Universities of California and Columbia (summer sessions), and (nita sheffield) instructor of physical education, tachers college. New York : A. S. Barnes and company, 1929: .

MLA

Sheffield Lyba, Sheffield Nitta coaut, .New York : A. S. Barnes and company, 1929: . .