Cita APA (7th ed.)
Petersen, R. A. (1991). Health issues for secondary teachers. Kendall/Hunt.
Cita Chicago (17th ed.)
Petersen, Ray A. Health Issues for Secondary Teachers. Dbuque, Iowa: Kendall/Hunt, 1991.
Cita MLA (9th ed.)
Petersen, Ray A. Health Issues for Secondary Teachers. Kendall/Hunt, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.