Cita APA (7th ed.)

Jaedicke, M. (1979). Helen Keller. Union-Verlag.

Cita Chicago (17th ed.)

Jaedicke, Martin. Helen Keller. Berlin: Union-Verlag, 1979.

Cita MLA (8th ed.)

Jaedicke, Martin. Helen Keller. Union-Verlag, 1979.