APA (7th ed.) Citation

Harper, R. E. (1949). A study of variation and correlation in chile pepper, Capsicum frutescens, L. [publisher not identified].

Chicago Style (17th ed.) Citation

Harper, Roy Ernest. A Study of Variation and Correlation in Chile Pepper, Capsicum Frutescens, L. [College Station, Tex.]: [publisher not identified], 1949.

MLA (9th ed.) Citation

Harper, Roy Ernest. A Study of Variation and Correlation in Chile Pepper, Capsicum Frutescens, L. [publisher not identified], 1949.