APA (7th ed.) Citation

Goodspeed, T. H., & Clausen, R. E. (1918). An apparatus for flower measurement. University of California Press.

Chicago Style (17th ed.) Citation

Goodspeed, T. H., and Roy Elwood Clausen. An Apparatus for Flower Measurement. Berkeley: University of California Press, 1918.

MLA (9th ed.) Citation

Goodspeed, T. H., and Roy Elwood Clausen. An Apparatus for Flower Measurement. University of California Press, 1918.