Não informado. (1939). Quarterly Bulletin on Solar Activity. International Astronomical Union.
Chicagoスタイル(17版)引用形式Não informado. Quarterly Bulletin on Solar Activity. Zurich, Suíça: International Astronomical Union, 1939.
MLA(8版)引用形式Não informado. Quarterly Bulletin on Solar Activity. International Astronomical Union, 1939.
警告: この引用は必ずしも正確ではありません.