Langley, S. P. (1904). The 1900 Solar Eclipse Expedition of the Astrophysical Observatory of the Smithsonian Institution. Government Printing Office.
Chicago-Zitierstil (17. Ausg.)Langley, S. P. The 1900 Solar Eclipse Expedition of the Astrophysical Observatory of the Smithsonian Institution. Washington: Government Printing Office, 1904.
MLA-Zitierstil (9. Ausg.)Langley, S. P. The 1900 Solar Eclipse Expedition of the Astrophysical Observatory of the Smithsonian Institution. Government Printing Office, 1904.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.