APA (7th ed.) Citation
Mills, L. H., Hawkins, G. C., & Wright, E. G. (1939). Book of trees. Rand McNally.
Chicago Style (17th ed.) Citation
Mills, Lewis Herald, Gertrude C. Hawkins, and Earl G. Wright. Book of Trees. Chicago: Rand McNally, 1939.
MLA (9th ed.) Citation
Mills, Lewis Herald, et al. Book of Trees. Rand McNally, 1939.
Warning: These citations may not always be 100% accurate.