Colby, T. F., Petrie, G., & O'Donovan, J. (1837). Ordnance survey of the county of Londonderry: Vol. 1. published for Her Majesty's Government, Hodges and Smith.
Chicago Style (17th ed.) CitationColby, Thomas Frederick, George Petrie, and John O'Donovan. Ordnance Survey of the County of Londonderry: Vol. 1. Dublin: published for Her Majesty's Government, Hodges and Smith, 1837.
MLA (9th ed.) CitationColby, Thomas Frederick, et al. Ordnance Survey of the County of Londonderry: Vol. 1. published for Her Majesty's Government, Hodges and Smith, 1837.
Warning: These citations may not always be 100% accurate.