A Guide to Parliamentary Papers: What They Are, How to Find Them, How to Use Them by P. Ford / LL 4th Floor & Reference: Z2009 A1 F6. This guide is very useful for information before 1960.
Oxford University Guide to Parliamentary Papers, Proceedings and Departmental Papers
Duke University Libraries Guide to British Parliamentary Papers
House of Commons Information Office: Government Publications (Command Papers) Factsheet
House of Commons Information Office: Parliamentary Papers Factsheet
Indiana University Library Guide to British Parliamentary Papers
An Introduction to British Government Publications by J.G. Olle / Langson Reference Z2009 A1 O46
The Journal of the House of Commons: A Bibliographical and Historical Guide by David Menhennet / Langson Reference JN673 .M45