Wallace Stevens on The Poetry Foundation
https://www.poetryfoundation.org/poems-and-poets/poets/detail/wallace-stevens
Links to many poems, with a more detailed biography.
on "Thirteen Ways of Looking at a Blackbird"
http://www.english.illinois.edu/maps/poets/s_z/stevens/blackbird.htm
An excellent introduction to relevant criticism on "Thirteen Ways of Looking at a Blackbird," presented as a series of excerpts. From the University of Illinois MAPS project, a database on Modern American poetry.
Interpretive Strategies and the Meanings of Artworks: The Hermeneutical Situation
http://www.rogergilman.com/2014/11/interpretive-strategies/
An essay by scholar Roger Gilman that offers three different detailed analyses of "Thirteen Ways of Looking at a Blackbird" as a way to show how different people can glean different meanings from one poem.
The Patron Saint of Inner Lives
https://www.theatlantic.com/magazine/archive/2016/04/the-patron-saint-of-inner-lives/471468/
An excellent biographical article on Stevens that offers insight into his inner life, his profession, and his process of composition.
Insurance Man: The Thrilling Mind of Wallace Stevens
http://www.newyorker.com/magazine/2016/05/02/the-thrilling-mind-of-wallace-stevens
An insightful and detailed article on Stevens that functions as a review of Paul Mariani's book The Whole Harmonium: The Life of Wallace Stevens.
Marianne Moore on Wallace Stevens
http://www.nybooks.com/articles/1964/06/25/on-wallace-stevens/
Recollections and thoughts on Wallace Stevens by fellow modernist poet Marianne Moore.
Talk with Mr. Stevens
http://www.nytimes.com/books/97/12/21/home/stevens-talk.html
A 1954 New York Times interview with Wallace Stevens.
Lukas Foss - Thirteen Ways Of Looking At A Blackbird (1978)
https://www.youtube.com/watch?v=sDngWFKY4K0
An avant-garde musical setting of "Thirteen Ways of Looking at a Blackbird" by composer Lukas Foss, the most prominent of several compositions based on the poem.