APA-viite (7. p.)

Whitman, R. B. Tractor Principles The Action, Mechanism, Handling, Care, Maintenance and Repair of the Gas Engine Tractor.

Chicago-viite (17. p.)

Whitman, Roger B. Tractor Principles The Action, Mechanism, Handling, Care, Maintenance and Repair of the Gas Engine Tractor.

MLA-viite (9. p.)

Whitman, Roger B. Tractor Principles The Action, Mechanism, Handling, Care, Maintenance and Repair of the Gas Engine Tractor.

Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.