Horatio Scott Carslaw, [The elements of non-Euclidean plane geometry and trigonometry (1916)][1]

Duncan M'Laren Young Sommerville [The elements of non-Euclidean geometry (1919)][2]


  [1]: http://archive.org/details/elementsofnoneuc00carsuoft
  [2]: http://archive.org/details/elementsofnoneuc00sommuoft