Cita APA (7a ed.)

Hegrad, F. (1793). Schriften. [s.n.].

Cita Chicago Style (17a ed.)

Hegrad, Friedrich. Schriften. Frankfurt ; Leipzig: [s.n.], 1793.

Cita MLA (9a ed.)

Hegrad, Friedrich. Schriften. [s.n.], 1793.