Ferris, C. D., & Miller, L. D. (1989). Supplement to A catalogue/checklist of the butterflies of America, north of Mexico. Lepidopterists' Society.
Chicago Style (17th ed.) CitationFerris, Clifford D., and Lee D. Miller. Supplement to A Catalogue/checklist of the Butterflies of America, North of Mexico. [Los Angeles?]: Lepidopterists' Society, 1989.
MLA (9th ed.) CitationFerris, Clifford D., and Lee D. Miller. Supplement to A Catalogue/checklist of the Butterflies of America, North of Mexico. Lepidopterists' Society, 1989.
Warning: These citations may not always be 100% accurate.