Cita APA (7a ed.)

Willers, F. A. (1923). Numerische Integration. Gruyter.

Cita Chicago Style (17a ed.)

Willers, Friedrich Adolf. Numerische Integration. Berlin [etc.]: Gruyter, 1923.

Cita MLA (9a ed.)

Willers, Friedrich Adolf. Numerische Integration. Gruyter, 1923.