Bowers, M. Deane (March 1981). "Unpalatability as a Defense Strategy of Western Checkerspot Butterflies (Euphydryas scudder, Nymphalidae)". Evolution. 35 (2): 367–375. doi:10.2307/2407845. JSTOR2407845. PMID28563381.
Tundis, Rosa; Loizzo, Monica; Menichini, Federica; Statti, Giancarlo; Menichini, Francesco (2008). "Biological and Pharmacological Activities of Iridoids: Recent Developments". Mini-Reviews in Medicinal Chemistry. 8 (4): 399–420. doi:10.2174/138955708783955926.
Bowers, M. Deane (March 1981). "Unpalatability as a Defense Strategy of Western Checkerspot Butterflies (Euphydryas scudder, Nymphalidae)". Evolution. 35 (2): 367–375. doi:10.2307/2407845. JSTOR2407845. PMID28563381.
Bowers, M. Deane (March 1981). "Unpalatability as a Defense Strategy of Western Checkerspot Butterflies (Euphydryas scudder, Nymphalidae)". Evolution. 35 (2): 367–375. doi:10.2307/2407845. JSTOR2407845. PMID28563381.