Sommer, J. A. (1950). School attitudes for youth. Queen's Work.
Chicago Style (17th ed.) CitationSommer, Joseph A. School Attitudes for Youth. St. Louis, Mo.: Queen's Work, 1950.
Cita MLASommer, Joseph A. School Attitudes for Youth. Queen's Work, 1950.
Atenció: Aquestes cites poden no estar 100% correctes.