References
^ Paul Kroeger (2012). Analyzing Grammar: An Introduction, Cambridge University Press. ISBN 9780521016537 (revised May 2012)^ Paul Kroeger (2012). Analyzing Grammar: An Introduction, Cambridge University Press. ISBN 9780521016537 (revised May 2012)^ Paul R. Kroeger (2015). Analyzing Grammar: An Introduction, Cambridge University Press. BiggerBooks. ISBN 9780521016537 (revised Dec 2023)
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