Townley, S. D. (1928). Harvard Catalogue of long Period variable Stars: By Sidney D. Townley, Annie J. Cannon and Leon Campbell. Observatory.
Chicago-Zitierstil (17. Ausg.)Townley, Sidney D. Harvard Catalogue of Long Period Variable Stars: By Sidney D. Townley, Annie J. Cannon and Leon Campbell. Cambridge, Mass: Observatory, 1928.
MLA-Zitierstil (9. Ausg.)Townley, Sidney D. Harvard Catalogue of Long Period Variable Stars: By Sidney D. Townley, Annie J. Cannon and Leon Campbell. Observatory, 1928.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.