Cita APA (7a ed.)

Einstein, C., & Westheim, P. Orbis Pictus. Ernst Wasmuth Verlag.

Cita Chicago Style (17a ed.)

Einstein, Carl, y Paul Westheim. Orbis Pictus. Berlin: Ernst Wasmuth Verlag.

Cita MLA (8a ed.)

Einstein, Carl, y Paul Westheim. Orbis Pictus. Ernst Wasmuth Verlag.