Various. Harper's Young People, April 26, 1881 An Illustrated Weekly.
Chicago-viite (17. p.)Various. Harper's Young People, April 26, 1881 An Illustrated Weekly.
MLA-viite (9. p.)Various. Harper's Young People, April 26, 1881 An Illustrated Weekly.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.