Bousfield, Aldridge Knight; Gugenheim, Victor K. A. M. (1976). 《On PL De Rham theory and rational homotopy type》. Memoirs of the American Mathematical Society (영어) 179. American Mathematical Society. doi:10.1090/memo/0179. ISBN978-0-8218-2179-4. MR425956.
Bousfield, Aldridge Knight; Gugenheim, Victor K. A. M. (1976). 《On PL De Rham theory and rational homotopy type》. Memoirs of the American Mathematical Society (영어) 179. American Mathematical Society. doi:10.1090/memo/0179. ISBN978-0-8218-2179-4. MR425956.