Gronquist, M., Bezzerides, A., Attygalle, A., Meinwald, J., Eisner, M., & Eisner, T. (2001). Attractive and defensive functions of the ultraviolet pigments of a flower (Hypericum calycinum). The National Academy of Sciences.

Gronquist, Matthew, Alexander Bezzerides, Athula Attygalle, Jerrold Meinwald, Maria Eisner, and Thomas Eisner. Attractive and Defensive Functions of the Ultraviolet Pigments of a Flower (Hypericum Calycinum). The National Academy of Sciences, 2001.

Gronquist, Matthew, et al. Attractive and Defensive Functions of the Ultraviolet Pigments of a Flower (Hypericum Calycinum). The National Academy of Sciences, 2001.