APA Citation

Prüfer, J., & Prüfer, J. (1930). Federico Froebel. Barcelona: Labor.

Chicago Style Citation

Prüfer, Johannes, and Johannes Prüfer. Federico Froebel. Barcelona: Labor, 1930.

MLA Citation

Prüfer, Johannes, and Johannes Prüfer. Federico Froebel. Barcelona: Labor, 1930.

Warning: These citations may not always be 100% accurate.