APA
Onions C. T., Friedrichsen G. W. S. & Burchfleld R. W. (1966). The Oxford dictionary of English etymology. Oxford: Clarendon Press.
Chicago
Onions C T, Friedrichsen G W S and Burchfleld R W. 1966. The Oxford dictionary of English etymology. Oxford: Clarendon Press.
Harvard
Onions C. T., Friedrichsen G. W. S. and Burchfleld R. W. (1966). The Oxford dictionary of English etymology. Oxford: Clarendon Press.
MLA
Onions C T, Friedrichsen G W S and Burchfleld R W. The Oxford dictionary of English etymology. Oxford: Clarendon Press. 1966.