Sheldon, D. S., & Penick, J. E. (1991). Favorite labs from outstanding teachers, vol.1. National Association of Biology Teachers.
Citace podle Chicago (17th ed.)Sheldon, Daniel S., a John E. Penick. Favorite Labs from Outstanding Teachers, Vol.1. Reston, VA: National Association of Biology Teachers, 1991.
Citace podle MLA (9th ed.)Sheldon, Daniel S., a John E. Penick. Favorite Labs from Outstanding Teachers, Vol.1. National Association of Biology Teachers, 1991.
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