APA
Chapman J., Andre P., . (1777). A Map of the County of Essex from an actual survey taken in MDCCLXXII: LXXIII & MDCCLXXIV. By John Chapman & Peter Andre. (A Plan of Colchester.--Harwich Harbour.) 4 miles [ = 200 mm]. London: J. Chapman & P. Andre.
Chicago
Chapman John, Andre Peter, . 1777. A Map of the County of Essex from an actual survey taken in MDCCLXXII: LXXIII & MDCCLXXIV. By John Chapman & Peter Andre. (A Plan of Colchester.--Harwich Harbour.) 4 miles [ = 200 mm]. London: J. Chapman & P. Andre.
Harvard
Chapman J., Andre P., . (1777). A Map of the County of Essex from an actual survey taken in MDCCLXXII: LXXIII & MDCCLXXIV. By John Chapman & Peter Andre. (A Plan of Colchester.--Harwich Harbour.) 4 miles [ = 200 mm]. London: J. Chapman & P. Andre.
MLA
Chapman John, Andre Peter, . A Map of the County of Essex from an actual survey taken in MDCCLXXII: LXXIII & MDCCLXXIV. By John Chapman & Peter Andre. (A Plan of Colchester.--Harwich Harbour.) 4 miles [ = 200 mm]. London: J. Chapman & P. Andre. 1777.