I am looking for scholarly sources for Capital Punishment and Child Rape
Probably the best place to start would be to try ProQuest Central (launch the Online Library, go to the Find Articles page and follow the linke to ProQuest Central). This is a great database to start your search, because it is a very expansive database.
I suggest going to the Advanced search page, clicking on the "full text" checkbox and the "peer reviewed" text boxes to limit your results and search for "capital punishment" in one search box, and for the next line, use the database's two different search boxes to add in the terms "Child rape" in one and "child rapist" in the one (using the quotes, to make it a phrase search) after the OR. That would be searching for either the terms "child rape" or "child rapist" with the additional required term "capital punishment."
I hope this helps!