Pennsylvania State Beekeepers' Association & Pennsylvania State Beekeepers' Association. (1928). Report of the Pennsylvania State Beekeepers' Association. Published by direction of the Secretary of Agriculture Harrisburg Publishing Co., state printer.
Chicago (17e ed.) BronvermeldingPennsylvania State Beekeepers' Association en Pennsylvania State Beekeepers' Association. Report of the Pennsylvania State Beekeepers' Association. Harrisburg, PA: Published by direction of the Secretary of Agriculture Harrisburg Publishing Co., state printer, 1928.
MLA (8e ed.) BronvermeldingPennsylvania State Beekeepers' Association en Pennsylvania State Beekeepers' Association. Report of the Pennsylvania State Beekeepers' Association. Published by direction of the Secretary of Agriculture Harrisburg Publishing Co., state printer, 1928.