(1968). Swimming and water safety textbook. American Nat. red cross s.
Cita Chicago Style (17a ed.)Swimming and Water Safety Textbook. Washington: American Nat. red cross s, 1968.
Cita MLA (9a ed.)Swimming and Water Safety Textbook. American Nat. red cross s, 1968.
Precaución: Estas citas no son 100% exactas.