These are some of the older ones:

Hayes, B. (1981).  Inconsistencies among nurses in breastfeeding knowledge
and counseling. JOGNN, Nov?Dec, 430-433.
Ellis, DJ & Hewat, RJ.  (1983).  Do nurses help or hinder mothers who
breastfeed?  J of Advanced Nursing, 8, 281-288.
Anderson, E. & Geden, E. (1989).  Nurses' Knowledge of BF, JOGNN, 20(1),
58-64.

Sincerely, Pat in SNJ

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