APA (7th ed.) Citation

Scudder, S. H. Group Characteristics of Some North American Butterflies—I. Wiley.

Chicago Style (17th ed.) Citation

Scudder, Samuel H. Group Characteristics of Some North American Butterflies—I. Wiley.

MLA (9th ed.) Citation

Scudder, Samuel H. Group Characteristics of Some North American Butterflies—I. Wiley.

Warning: These citations may not always be 100% accurate.