Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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