Very important! You must give credit for every picture, video, and music you use within your movie. Although your use of copyrighted material is permitted under the "Fair Use" law for school purposes, you still MUST list the source for each picture, video, and song.

The best way to do this for a documentary is to list them in the rolling credits at the end. Listing the web addresses for each will be sufficient, for example:

Photo sources:
http://icons.mysitemyway.com/wp-content/gallery/matte-white-square-icons-media/thumbs/thumbs_125226-matte-white-square-icon-media-a-media28-stop.png
http://static-p3.fotolia.com/jpg/00/10/07/66/400_F_10076638_EcocRzIhcYi2Hu731M5HNNMequhqEDAJ.jpg
http://www.iowacitylist.com/Tools-/Pneumatic-Tools-/Telemecanique-red-stop-button-cm-12-pg-13-5-iso-20-image.jpg
etc.

Music sources:
http://www.4shared.com/audio/104952040/165b4377/Tiesto_feat_Kane_-_Rain_Down_On_Me__Dj_Tiesto_Rmx_.mp3

Video sources:
http://www.cbsnews.com/video/watch/?id=5527955n