1. 1. Armstrong , Joe Edwin:The Water Clocks of Ktesibios. Their Origin and Reconstructions.Thesis ... for the Degree of Master of Arts. San Jose State University. 1974 .
2. 2. A. G. Drachmann : "Hero's and Pseudo-Hero's Adjustable Siphons."Journal of Hellenic Studies, 52, 1932 , p.116 -118 .
3. 3. The Same:Ktesibios, Philon and Heron. A Study in Ancient Pneumatics.Copenhagen 1948 , p. 36 sqq.
4. 4. Heronis Alexandrini Opera qvae supersunt omnia. G. B. Teubner , Leipzig. Vol. 1: Pneumatica et Automata. Rec. Guilelmus Schmidt, 1899 , p. xxix and Supplement p. 57 sqq.