Pennsylvania State Beekeepers' Association. (1928). Official organ of the Pennsylvania State Bee-Keepers' Association. The Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Pennsylvania State Beekeepers' Association. Official Organ of the Pennsylvania State Bee-Keepers' Association. [S.l.]: The Association, 1928.
Παραπομπή σε μορφή MLA (8th εκδ.)Pennsylvania State Beekeepers' Association. Official Organ of the Pennsylvania State Bee-Keepers' Association. The Association, 1928.
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