Masoretic Text
For the Old Testament the translators primarily made use of the Masoretic Text as presented by Rudolf Kittel in his 3rd Edition of the "Biblia Hebraica" (1937). In addition to the Masoretic Text, the translators also made use of the Dead Sea Scrolls, the Samaritan Pentateuch, the Greek Septuagint, the Aramaic Targums, and the Syriac "Peshitta".