Cita APA (7a ed.)

Quispel, G. (1947). The original doctrine of Valentine. [s.n.].

Cita Chicago Style (17a ed.)

Quispel, Gilles. The Original Doctrine of Valentine. [S.l.]: [s.n.], 1947.

Cita MLA (9a ed.)

Quispel, Gilles. The Original Doctrine of Valentine. [s.n.], 1947.