APA (7th ed.) Citation

North East Development Association. (1950). A physical land classification of Northumberland, Durham and part of the North Riding of Yorkshire. [publisher not identified].

Chicago Style (17th ed.) Citation

North East Development Association. A Physical Land Classification of Northumberland, Durham and Part of the North Riding of Yorkshire. [Newcastel upon Tyne]: [publisher not identified], 1950.

MLA (9th ed.) Citation

North East Development Association. A Physical Land Classification of Northumberland, Durham and Part of the North Riding of Yorkshire. [publisher not identified], 1950.