Cita APA (7a ed.)

Zweig, S., Strauss, R., Knight, M., & Lowinsky, E. E. (1977). A Confidential matter: The Letters of Richard Strauss and Stefan Zweig, 1931-1935. University of California.

Cita Chicago Style (17a ed.)

Zweig, Stefan, Richard Strauss, Max Knight, y Edward E. Lowinsky. A Confidential Matter: The Letters of Richard Strauss and Stefan Zweig, 1931-1935. Berkeley: University of California, 1977.

Cita MLA (9a ed.)

Zweig, Stefan, et al. A Confidential Matter: The Letters of Richard Strauss and Stefan Zweig, 1931-1935. University of California, 1977.