If you want to know more about the events portrayed in the book then there are a few resources here. The best place to start is the short videos at the bottom.

Some of these books may be out of print and difficult to find.

Sabra and Shatila Inquiry into a Massacre
This slim volume is an investigation carried out by French-Israeli journalist Amnon Kapeliouk soon after events and published in 1983. It is based on interviews with Israeli soldiers and others.

Sabra and Shatila: September 1982
The most authoritative and comprehensive analysis of the massacre by Professor Bayan Nuwayhed Al-Hout at the Lebanese University.

Pity the Nation: Lebanon at War
Robert Fisk's book gives an insightful account of Lebanon's troubled history and the build-up to the Israeli invasion and the massacre.

From Beirut to Jerusalem
A personal account of events by British surgeon Swee Chai Ang who was working in the camps at the time of the massacre and testified at the Kahane inquiry.

Waltz with Bashir [DVD] [2008] Ari Folman's film ultimately pulls its punches but is nevertheless the first time an Israeli has addressed the country's role in events on film. See my review here.

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A short film from Al-Jazeera (in English) made on the 25th anniversary of the massacre.

A timeline of events leading up to the massacre. You may have to pause the movie to read the individual events.