Stewart, J. D. (1958). British pressure groups: Their role in relation to the House of Commons. Clarendon Press.
Chicago-referens (17:e uppl.)Stewart, John David. British Pressure Groups: Their Role in Relation to the House of Commons. Oxford: Clarendon Press, 1958.
MLA-referens (9:e uppl.)Stewart, John David. British Pressure Groups: Their Role in Relation to the House of Commons. Clarendon Press, 1958.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.