Recently introduced varieties of head lettuce and methods used in their development /

Chicago citation style
Bohn, G. W. (Guy Weston), 1909-. Recently introduced varieties of head lettuce and methods used in their development /. 1951. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/011394637. (Accessed December 9, 2018.)
APA citation style
Bohn, G. W. (Guy Weston), 1909-, (1951) Recently introduced varieties of head lettuce and methods used in their development /. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/011394637
MLA citation style
Bohn, G. W. (Guy Weston), 1909-. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/011394637>.
Note: These citations are programmatically generated and may be incomplete.