The primary source used to investigate this will be Books 2, 3 and 7 in Arrian’s The Campaigns of Alexander. By looking at events such as Alexander’s journey to the shrine of Ammon, the untying of the Gordian knot, the visits to the tombs of his alleged ancestors Heracles and Achilles, his military victories and finally the legend he leaves behind in Book 7 after he dies.
Plutarch, Curtius and books 1, 4, 5 and 6 of Arrian are available secondary sources that contain relevant information which will be useful, albeit to a lesser extent. Robin Lane-Fox’s Alexander the Great provides a more modern historical view on Alexander which gives both comparisons and contrasts to Arrian.
The untying of the Gordian knot is one of Alexander’s most famous acts of intelligence, or intolerance