Cita APA (7a ed.)

Howarth, S. (1992). Sea Shell: The story of Shell's British tanker fleets, 1892-1992. Thomas Reed.

Cita Chicago Style (17a ed.)

Howarth, Stephen. Sea Shell: The Story of Shell's British Tanker Fleets, 1892-1992. London [etc.]: Thomas Reed, 1992.

Cita MLA (9a ed.)

Howarth, Stephen. Sea Shell: The Story of Shell's British Tanker Fleets, 1892-1992. Thomas Reed, 1992.