APA
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 s.20. London: Greater London Council.
Chicago
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 s.20. London: Greater London Council.
Harvard
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 s.20. London: Greater London Council.
MLA
Greater London Council, .London: Greater London Council. .
