APA

Greater London Council, . (1974). London Building Acts (Amendment) Act 1939, S.20. Code of practice for buildings of excess height and / or additional cubical extent requiring approval under Section 20 of the London Building Acts (Amendment) Act 1939. London: Greater London Council.

Chicago

Greater London Council, . 1974. London Building Acts (Amendment) Act 1939, S.20. Code of practice for buildings of excess height and / or additional cubical extent requiring approval under Section 20 of the London Building Acts (Amendment) Act 1939. London: Greater London Council.

Harvard

Greater London Council, . (1974). London Building Acts (Amendment) Act 1939, S.20. Code of practice for buildings of excess height and / or additional cubical extent requiring approval under Section 20 of the London Building Acts (Amendment) Act 1939. London: Greater London Council.

MLA

Greater London Council, . London Building Acts (Amendment) Act 1939, S.20. Code of practice for buildings of excess height and / or additional cubical extent requiring approval under Section 20 of the London Building Acts (Amendment) Act 1939. London: Greater London Council. 1974.