Abraham, J. J. (1933). Lettsom, his life, times, friends and descendants. W. Heinemann, ltd..
Citazione stile Chigago Style (17a edizione)Abraham, James Johnston. Lettsom, His Life, Times, Friends and Descendants. London: W. Heinemann, ltd., 1933.
Citatione MLA (8a ed.)Abraham, James Johnston. Lettsom, His Life, Times, Friends and Descendants. W. Heinemann, ltd., 1933.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.