1 2 Smallwood 1995, p.133. ↑ Northrop 1955, p.111 ↑ http://www.enginehistory.org/members/articles/ACEnginePerfAnalysisR-R.pdf preface ↑ http://www.historylearningsite.co.uk/world-war-two/world-war-two-in-western-europe/battle-of-britain/sir-stanley-hooker/ ↑ http://www.enginehistory.org/members/articles/ACEnginePerfAnalysisR-R.pdf preface ↑ Payton-Smith 1971, pp. 259–260. ↑ Mankau and Petrick 2001, pp. 24–29. ↑ Griehl 1999, p. 8. ↑ Price, 1982. p. 170. ↑ Berger & Street, 1994. p.