Cita APA (7a ed.)

Rigge, W. F. (1912). The Value of a Cobweb. s.n.

Cita Chicago Style (17a ed.)

Rigge, William F. The Value of a Cobweb. [S.l.: s.n, 1912.

Cita MLA (9a ed.)

Rigge, William F. The Value of a Cobweb. s.n, 1912.