APA
BLANCHARD R. J., FARREL L., . (1981). Guide to sources for agricultural and biological research. Berkeley: University of California.
Chicago
BLANCHARD Richard J, FARREL Louis, . 1981. Guide to sources for agricultural and biological research. Berkeley: University of California.
Harvard
BLANCHARD R. J., FARREL L., . (1981). Guide to sources for agricultural and biological research. Berkeley: University of California.
MLA
BLANCHARD Richard J, FARREL Louis, . Guide to sources for agricultural and biological research. Berkeley: University of California. 1981.