La Critique du Language. Kanz al-Huffaz fi Kitab Tahzib al-Alfaz.

Ibn al-Sikkit of Baghdad, the acknowledged scholar of lexicography and syntax, was tutor to Mutawakkkil’s son. “Although he is mostly counted among the Kufan grammarians, he received his professional education in Baghdad, where his teachers were, among others, al-Fraa’, Qutrub, abu ‘Obaida and al-Asma’i.
Most of ibn al-Sikkit’s work has not been preserved, but his influence has been considerable in view of the facts that he is extensively quoted by almost all later lexicographers. His main interest were poetry and lexicography, but it is important to note that in his most important lexicographical work, the Kitab Islah al-Mantiq, he arranged his material at least in part according to morphological criteria.” Lexicon Grammaticorum, p. 695.