Knowles, D. (2008). Medium/heavy duty truck technician certification test preparation manual (2nd ed.). Thomson/ Delmar Learning.
Lua i Stíl Chicago (17ú heag.)Knowles, Don. Medium/heavy Duty Truck Technician Certification Test Preparation Manual. 2nd ed. Clifton Park, NY: Thomson/ Delmar Learning, 2008.
Lua MLA (8ú heag.)Knowles, Don. Medium/heavy Duty Truck Technician Certification Test Preparation Manual. 2nd ed. Thomson/ Delmar Learning, 2008.
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