Percy Bysshe Shelley - Poetry Foundation
https://www.poetryfoundation.org/poets/percy-bysshe-shelley
Percy Shelley's homepage on Poetry Foundation, featuring an extensive biography and further links to his work.
Shelley on Poetry and the Art of Seeing
https://www.brainpickings.org/2019/09/30/shelley-defence-of-poetry/
An article that unpacks Shelley's writing on poetry's power to illuminate the world from treatise Defence of Poetry.
Landscape and the Sublime
https://www.bl.uk/romantics-and-victorians/articles/landscape-and-the-sublime
An article on the British Library blog about the role landscape and the sublime played in Romantic poetry.
Mont Blanc: Lines Written in the Vale of Chamouni
https://www.poetryfoundation.org/poems/45130/mont-blanc-lines-written-in-the-vale-of-chamouni
Shelley's poem "Mont Blanc: Lines Written in the Vale of Chamouni," another example of his use of the sublime in nature.
Select Letters of Percy Bysshe Shelley
https://archive.org/details/selectlettersofp00shelrich/page/n11
Full interactive text of Shelley's collected letters, including correspondence from his time in Italy during 1818.