Speakman, J. C. (1955). An introduction to the electronic theory of valency (3rd ed.). London: Edward Arnold.
Παραπομπή Chicago StyleSpeakman, J. C. An Introduction to the Electronic Theory of Valency. 3rd ed. London: Edward Arnold, 1955.
Παραπομπή MLASpeakman, J. C. An Introduction to the Electronic Theory of Valency. 3rd ed. London: Edward Arnold, 1955.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.