This Wikipedia article gives a good overview of the case, as well as an extensive bibliography at the end.
"Jean McConville's murder, the Boston tapes, Gerry Adams, and the Ivor Bell trial" - from the Irish Times
"Who killed Jean McConville? Did a secret archive at Boston College hold a clue?" - from the Boston Globe magazine
"Secrets from Belfast: How Boston College's oral history of the troubles fell victim to an international murder investigation"
"Boston tapes: Q&A on secret Troubles confessions"
"Why a 1972 Northern Ireland murder matters so much to historians" - from the Washington Post