Countee Cullen
https://www.poetryfoundation.org/poets/countee-cullen
Poetry Foundation biography of Countee Cullen with links to his most famous poems.
Biography of Countee Cullen
http://www.myblackhistory.net/Countee_Cullen.htm
Short summary of Cullen's life from My Black History.
On Countee Cullen’s “Heritage”
https://alexsheremet.com/on-countee-cullens-heritage/
A section-by-section close reading of "Heritage."