References
- Bonnet , R. L. and Keen , G. D. 1991 . Botany, 49 more science fair projects , Blue Ridge Summit, Pa. : Tab Books .
- Chant , A. E. 1987 . Science: Life health earth physical. Level D , Toronto : Globe/Modern Curriculum Press .
- Crasso , P. 1987 . Science: Life health earth physical. Level E , Toronto : Globe/Modern Curriculum Press .
- Liem , T. L. 1992 . Invitations to science inquiry , Chino Hills, Calif. : Science Inquiry Enterprises .
- Raven , P. H. , Evert , R. F. and Eichhorn , S. E. 1992 . Biology of plants, 5th ed , New York : Worth Publishers .
- VanCleave , J. P. 1993 . 20 awesome, magical, bizarre and incredible experiments , New York : Wiley .
- Walker , C. 1993 . Plant reproduction , Cleveland, Ohio : Modern Curriculum Press .
- Walker , C. 1993 . How plants live and grow , Cleveland, Ohio : Modern Curriculum Press .
- Wood , R. W. 1991 . Science for kids. 39 easy plant biology experiments , Blue Ridge Summit, Pa. : Tab Books .
- Lew , L. Y. 1999 . The versatile onions . Science Activities , 36 ( 2 ) : 10 – 17 . Washington, D.C.: Heldref Publications