Cita APA (7th ed.)

Wells, H. (1951). Elementary science education in American public schools. McGraw-Hill.

Cita Chicago (17th ed.)

Wells, Harrington. Elementary Science Education in American Public Schools. New York: McGraw-Hill, 1951.

Cita MLA (9th ed.)

Wells, Harrington. Elementary Science Education in American Public Schools. McGraw-Hill, 1951.