Cita APA (7a ed.)

Hough, B. O. (1918). Ocean traffic and trade. LaSalle Extension University.

Cita Chicago Style (17a ed.)

Hough, B. Olney. Ocean Traffic and Trade. Chicago: LaSalle Extension University, 1918.

Cita MLA (9a ed.)

Hough, B. Olney. Ocean Traffic and Trade. LaSalle Extension University, 1918.