Dyfyniad APA

Sheldon, D. S., & Penick, J. E. (1991). Favorite labs from outstanding teachers, vol.1. National Association of Biology Teachers.

Dyfyniad Arddull Chicago

Sheldon, Daniel S., and John E. Penick. Favorite Labs from Outstanding Teachers, Vol.1. Reston, VA: National Association of Biology Teachers, 1991.

Dyfyniad MLA

Sheldon, Daniel S., and John E. Penick. Favorite Labs from Outstanding Teachers, Vol.1. National Association of Biology Teachers, 1991.

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