Ehrstine, J. W., & Blake, W. (1967). William Blake's Poetical sketches. Washington State University Press.
Lua i Stíl Chicago (17ú heag.)Ehrstine, John W., agus William Blake. William Blake's Poetical Sketches. [Pullman]: Washington State University Press, 1967.
Lua MLA (9ú heag.)Ehrstine, John W., agus William Blake. William Blake's Poetical Sketches. Washington State University Press, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.