Cita APA (7th ed.)

Boldt, R. (1982). Friedrich Wilhelm August Fröbel. Urania Verlag.

Cita Chicago (17th ed.)

Boldt, Rosemarie. Friedrich Wilhelm August Fröbel. Leipzig: Urania Verlag, 1982.

Cita MLA (8th ed.)

Boldt, Rosemarie. Friedrich Wilhelm August Fröbel. Urania Verlag, 1982.