APA (7 वां संस्करण) प्रशस्ति पत्र

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

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

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

एमएलए (9वां संस्करण) प्रशस्ति पत्र

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

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