Cita APA (7a ed.)

Allen, F. C. (1931). Railroad curves and earthwork (7th ed.). McGraw-Hill.

Cita Chicago Style (17a ed.)

Allen, Frank C. Railroad Curves and Earthwork. 7th ed. London: McGraw-Hill, 1931.

Cita MLA (9a ed.)

Allen, Frank C. Railroad Curves and Earthwork. 7th ed. McGraw-Hill, 1931.