Cita APA (7a ed.)
Preston, R. C., & Henry, N. B. (1957). Social studies in the elementary school: Part II.
Cita estilo Chicago (17a ed.)
Preston, Ralph C., y Nelson B. Henry. Social Studies in the Elementary School: Part II. 1957.
Cita MLA (9a ed.)
Preston, Ralph C., y Nelson B. Henry. Social Studies in the Elementary School: Part II. 1957.
警告：這些引文格式不一定是100％准確.