Cita APA (7a ed.)

Shell. (1955). Know Your Tractor: A shell guide. The Shell Petroleum Company Limited.

Cita Chicago Style (17a ed.)

Shell. Know Your Tractor: A Shell Guide. London: The Shell Petroleum Company Limited, 1955.

Cita MLA (8a ed.)

Shell. Know Your Tractor: A Shell Guide. The Shell Petroleum Company Limited, 1955.