Cita APA (7a ed.)

Simmons, E. H. H. (1928). Safeguarding the nation's capital. [s.n.].

Cita Chicago Style (17a ed.)

Simmons, Edward Henry Harriman. Safeguarding the Nation's Capital. [S.l.]: [s.n.], 1928.

Cita MLA (9a ed.)

Simmons, Edward Henry Harriman. Safeguarding the Nation's Capital. [s.n.], 1928.