Dyfyniad APA

Sund, R. B., Tillery, B. W., & Trowbridge, L. W. (1970). Elementary science discovery lessons. Allyn and Bacon.

Dyfyniad Arddull Chicago

Sund, Robert B., Bill W. Tillery, and Leslie W. Trowbridge. Elementary Science Discovery Lessons. Boston: Allyn and Bacon, 1970.

Dyfyniad MLA

Sund, Robert B., et al. Elementary Science Discovery Lessons. Allyn and Bacon, 1970.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.