P-ISSN 0008-0845
E-ISSN 2160-8091
Vol. 14, Issue 6, 1960June 01, 1960 PDT 
ccby-nc-nd-4.0 
Leaf analysis and fertilizer response 
Leaf analysis and fertilizer response
E Proebsting,   
Proebsting, E. 1960. “Leaf Analysis and Fertilizer Response.” California Agriculture 14 (6): 10–10.