Não informado. (1953). Contributions from the Perkins Observatory. Ohio State University, Ohio Wesleyan University.
Chicagoスタイル(17版)引用形式Não informado. Contributions from the Perkins Observatory. Delaware, Ohio: Ohio State University, Ohio Wesleyan University, 1953.
MLA(8版)引用形式Não informado. Contributions from the Perkins Observatory. Ohio State University, Ohio Wesleyan University, 1953.
警告: この引用は必ずしも正確ではありません.