Ball, R. S. (1892). Star-Land: Being talks with young people about the wonders of the hevens. London: Casssell & Company.
Παραπομπή Chicago StyleBall, Robert Stawell. Star-Land: Being Talks With Young People About the Wonders of the Hevens. London: Casssell & Company, 1892.
Παραπομπή MLABall, Robert Stawell. Star-Land: Being Talks With Young People About the Wonders of the Hevens. London: Casssell & Company, 1892.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.