Cita APA (7a ed.)

Janssen, J. M. A. (1950). On the ideal lifetime of the Egyptians. [s.n.].

Cita Chicago Style (17a ed.)

Janssen, Jozef M. A. On the Ideal Lifetime of the Egyptians. [S.l.]: [s.n.], 1950.

Cita MLA (9a ed.)

Janssen, Jozef M. A. On the Ideal Lifetime of the Egyptians. [s.n.], 1950.