Poets.org entry on Countee Cullen
https://poets.org/poet/countee-cullen
Helpful biographical information on Cullen's life
Jazz or Junk?
http://xroads.virginia.edu/~MA03/faturoti/harlem/collage/artistic.html
Academic blog entry on the relationship and disagreements between Countee Cullen and Langston Hughes
Countee Cullen and the Racial Mountain
http://bostonreview.net/poetry-books-ideas/countee-cullen-and-racial-mountain
An article on Countee Cullen's understanding of race and art