Não informado. (1891). American school board journal. American School Board.
Chicago-referens (17:e uppl.)Não informado. American School Board Journal. Milwaukee, Wis: American School Board, 1891.
MLA-referens (8:e uppl.)Não informado. American School Board Journal. American School Board, 1891.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.