Cita APA (7th ed.)
Preston, R. C., & Henry, N. B. (1957). Social studies in the elementary school: Part II.
Cita Chicago (17th ed.)
Preston, Ralph C., i Nelson B. Henry. Social Studies in the Elementary School: Part II. 1957.
Cita MLA (9th ed.)
Preston, Ralph C., i Nelson B. Henry. Social Studies in the Elementary School: Part II. 1957.
Atenció: Aquestes cites poden no estar 100% correctes.