Porter, J. G. (1891). Charts and micrometrical Measures of Nebulae, made in the years 1884, 1885, and 1886. Board of Directors of the University.
Chicago-Zitierstil (17. Ausg.)Porter, Jermain Gildersleeve. Charts and Micrometrical Measures of Nebulae, Made in the Years 1884, 1885, and 1886. Cincinnati: Board of Directors of the University, 1891.
MLA-Zitierstil (9. Ausg.)Porter, Jermain Gildersleeve. Charts and Micrometrical Measures of Nebulae, Made in the Years 1884, 1885, and 1886. Board of Directors of the University, 1891.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.