APA (7th ed.) Citation

Beal, W. J., & Longyear, B. (1903). A study of plant leaves. Michigan State Agricultural College, Experiment Station, Botanical Department.

Chicago Style (17th ed.) Citation

Beal, W. J., and B.O Longyear. A Study of Plant Leaves. Agricultural College, Mich.: Michigan State Agricultural College, Experiment Station, Botanical Department, 1903.

MLA (9th ed.) Citation

Beal, W. J., and B.O Longyear. A Study of Plant Leaves. Michigan State Agricultural College, Experiment Station, Botanical Department, 1903.