Here are some books on statutory construction and Interpretation, which can be found in the public domain. I hope the can be helpful. If any anyone feels offence at my posting of such material, then I apologise in advance, my only intention is to provide knowledge to your worthy cause.
The books are as follows:
Handbook on the construction and interpretation of the laws
http://rapidshare.com/files/238699787/_Handbook_on_the_construction_and_interpretation_of_the_laws_.pdf
On the Interpretation of Statutes
http://rapidshare.com/files/238700598/_On_the_Interpretation_of_Statutes__.pdf
Popular Law-making: A Study of the Origin History and Present Tendencies of Law-making by Statute
http://rapidshare.com/files/238701377/Popular_Law-making.pdf
Statutes and Statutory Construction
http://rapidshare.com/files/238703536/_Statutes_and_Statutory_Construction_.pdf
Statute Law: The Principles which Govern the Construction and Operation of Statutes
http://rapidshare.com/files/238702031/_Statute_Law__The_Principles_which_Govern_the_Construction_and_Operation_of_Statutes__.pdf
The mechanics of law making
http://rapidshare.com/files/238704263/_The_mechanics_of_law_making_.pdf
The justice's manual with the Justices Statute
http://rapidshare.com/files/238705968/_The_justice_s_manual__with_the_Justices__Statute__.pdf
One again I hope this helps. knowledge is power