CS1 maint: Explicit use of et al. (link) ↑ Machines: A Pictorial History; Sigvard Strandh. ISBN 84-86115-20-5 ↑ http://services.eng.uts.edu.au/~johnd/ICEngines/HISTORY%20OF%20THE%20OTTO.pdf ↑ Zeleznik, F. J.; Mcbride, B. J. "Modeling the Internal Combustion Engine".