↑ 2,02,12,2Domonoske, Arthur Boquer; Finch, Volney Cecil (1936). Aircraft engines: theory, analysis, design, and operation (Engineering textbook). J. Wiley & Sons. str. 7. Pridobljeno 25. aprila 2014. The W, or broad arrow engine, has three rows of cylinders of which the central row is vertical with the other two rows forming equal angles with the vertical.{{navedi knjigo}}: Vzdrževanje CS1: url-status (povezava)
↑Rajput, R. K. Internal Combustion Engines. New Delhi, India: Laxmi Publications. ISBN817008637X. Pridobljeno 17. decembra 2013. W-engine Same as V-engine except with three banks of cylinders on the same crankshaft.