1. I. Asimov, The Early Asimov, vol 3 (Panther Books, St Albans, 1974), p. 110
2. I. Asimov, The Early Asimov, vol 3 (Panther Books, St Albans, 1974), pp. 119–120
3. I. Asimov, The endochronic properties of resublimated thiotimoline, in Astounding Science Fiction, (1948), pp. 120–125
4. I. Asimov, The micropsychiatric applications of thiotimoline, in Astounding Science Fiction, (1953), pp. 107–116
5. J.H. Pomeroy, Progress report, in Astounding Science Fiction, (1949), pp. 31–40