The Gnostics. What is Gnosticism? Beginnings

Recommended book (can get it free on Internet pdf): Hans Jonas: "The Gnostic Religion: The Message of the Alien God and the Beginnins of Christianity" (1940).
Etienne Couvert ‘ From Gnosis to Ecumenism’
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Early Gnosticism:
St Irineus: Five Books against Heresies
St Ephrem of Syria's anti-Gnostic Hymns
St Epiphanius: Treatise on Heresies
Theodoret's Heretical Fables
Books by Tertulian against Valentinus and Marcion
The Register of Heresies - compiled by Philastrus, Bishop of Brescia