APA Citation

Metcalfe, J. E., & Astle, C. Improve your English: The essential guide to English grammar, punctuation and spelling.

Chicago Style Citation

Metcalfe, J. E., and C. Astle. Improve Your English: The Essential Guide to English Grammar, Punctuation and Spelling.

MLA Citation

Metcalfe, J. E., and C. Astle. Improve Your English: The Essential Guide to English Grammar, Punctuation and Spelling.

Warning: These citations may not always be 100% accurate.