APA Format
Parkinson, G.H.R.; Parkinson, G.H.R.. (1989).
An Encyclopaedia of philosophy / general editor G.H.R. Parkinson
. London :: Routledge,.
MLA Format
Parkinson, G.H.R.; Parkinson, G.H.R..
An Encyclopaedia of philosophy / general editor G.H.R. Parkinson
. London :: Routledge,, 1989
Chicago Format
Parkinson, G.H.R.; Parkinson, G.H.R.. An Encyclopaedia of philosophy / general editor G.H.R. Parkinson. London :: Routledge,, 1989.