Cita APA (7th ed.)

Heine, H., & Hirth, F. E. (1949). Briefe. Kupferberg.

Cita Chicago (17th ed.)

Heine, Heinrich, i Friedrich Eugen Hirth. Briefe. Mainz: Kupferberg, 1949.

Cita MLA (8th ed.)

Heine, Heinrich, i Friedrich Eugen Hirth. Briefe. Kupferberg, 1949.