Singh Sadhu. (2020). Theory of Machines (14th.). Pearson.
Lua i Stíl Chicago (17ú heag.)Singh Sadhu. Theory of Machines. 14th. New Delhi: Pearson, 2020.
Lua MLA (9ú heag.)Singh Sadhu. Theory of Machines. 14th. Pearson, 2020.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.