Não informado. Publications of the Allegheny Observatory of the University of Pittsburgh. University of Pittsburgh.
Chicago Style (17th ed.) CitationNão informado. Publications of the Allegheny Observatory of the University of Pittsburgh. Lancaster, Pa: University of Pittsburgh.
MLA (8th ed.) CitationNão informado. Publications of the Allegheny Observatory of the University of Pittsburgh. University of Pittsburgh.
Warning: These citations may not always be 100% accurate.