Walker describes it as "an exceedingly frank confession of the points of difference between himself and the Ismaili , on the one hand, and the intellectual, religious world all around him, on the other". For Walker, it is perhaps the "[best] place to look for a definition of [Isma'ili Shiism] in its fourth / tenth-century manifestation", while Farhad Daftary, points out that it "presents a summary exposition of Ismaili doctrine and preserves remnants of the mythological cosmology propounded by the early Ismailis, including the spiritual beings called , and which mediated between the spiritual and the physical worlds". The work was first partially published by Mustafa Ghalib in 1980 (Beirut, Dar al-Andalus), but "suffers from inaccuracies and serious omissions". In 2000 a "definitive" edition with an English commentary was published by Ismail K. Poonawala (Beirut, Dar al-Gharb al-Islami). Al-Yanabi The ('Book of the Wellsprings/Sources [of Wisdom]'), was written around 961, and extensively paraphrased by the 11th-century Nasir Khusraw in his own . The work is a collection of treatises on about forty themes or 'wellsprings'. According to Daftary, the work's primary theme is "the wellsprings of human knowledge and spiritual life in each era of religious history", while Walker emphasizes that "portions of this work are purely Neoplatonic in the tone and in the content of its teachings; other sections bring these concepts in line with the author's Shiite interpretation of religious knowledge and its purveyors". The work was first published in a critical edition, with a partial French translation () in Henry Corbin's 1961 Trilogie Ismailienne (Tehran, Département d’Iranologie de l’Institut Franco-Iranien and Paris, A. Maisonneuve). An Arabic edition was published by Mustafa Ghalib in 1965 (Beirut, al-Maktab al-Tijari), and an English translation by Paul Walker in 1994 as part of The Wellsprings of Wisdom: A Study of Abu Yaqub al-Sijistani's Kitab al-Yanabi (Salt Lake City, University of Utah Press). Al-Maqalid The ('Book of the Keys'), comprises seventy chapters. According to Walker, it is of exceptional importance as it is "relatively late and by any account the most comprehensive" of al-Sijistani's works, but remains unpublished. Al-Nusra The ('Book of the Support/Defence'), is no longer extant, except for extensive quotations in Hamid al-Din al-Kirmani's . The work is one of al-Sijistani's earlier writings, composed as a defence of his predecessor and teacher, Muhammad al-Nasafi, against the accusations of antinomianism by Abu Hatim Ahmad ibn Hamdan al-Razi. Sullam al-najat The ('Ladder