Pennsylvania State Beekeepers' Association. (1928). Official organ of the Pennsylvania State Bee-Keepers' Association. The Association.
Chicago-referens (17:e uppl.)Pennsylvania State Beekeepers' Association. Official Organ of the Pennsylvania State Bee-Keepers' Association. [S.l.]: The Association, 1928.
MLA-referens (8:e uppl.)Pennsylvania State Beekeepers' Association. Official Organ of the Pennsylvania State Bee-Keepers' Association. The Association, 1928.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.