Cita APA (7a ed.)

Jaedicke, M. (1982). Helen Keller. Union-Verlag.

Cita Chicago Style (17a ed.)

Jaedicke, Martin. Helen Keller. Berlin: Union-Verlag, 1982.

Cita MLA (8a ed.)

Jaedicke, Martin. Helen Keller. Union-Verlag, 1982.