APA   Click to copy
Turing, A. M. (1938). Systems of logic based on ordinals (PhD thesis). Princeton University.

Chicago/Turabian   Click to copy
Turing, Alan Mathison. “Systems of Logic Based on Ordinals.” PhD thesis, Princeton University, 1938.

MLA   Click to copy
Turing, Alan Mathison. Systems of Logic Based on Ordinals. Princeton University, 1938.

@phdthesis{alan1938a,
  title = {Systems of logic based on ordinals},
  year = {1938},
  school = {Princeton University},
  author = {Turing, Alan Mathison}
}