^Block E., Gillies J.Z., Gillies C.W., Bazzi A.A., Putman D., Revelle L.K., Wang D., Zhang X. Allium Chemistry: Microwave Spectroscopic Identification, Mechanism of Formation, Synthesis, and Reactions of (E,Z)-Propanethial S-Oxide, the Lachrymatory Factor of the Onion (Allium cepa). J. Am. Chem. Soc. 1996, 118 (32): 7492–7501. doi:10.1021/ja960722j.
^G. Rindorf; L. Carlsen. The crystal and molecular structures of the thiobenzophenone S-oxide and thiobenzophenone. Acta Crystallogr. 1979, B35 (5): 1179–1182. doi:10.1107/S0567740879005835.