APA (7th ed.) Citation

American School of Correspondence. (2010). Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. Project Gutenberg.

Chicago Style (17th ed.) Citation

American School of Correspondence. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, Etc. Etc. Project Gutenberg, 2010.

MLA (9th ed.) Citation

American School of Correspondence. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, Etc. Etc. Project Gutenberg, 2010.

Warning: These citations may not always be 100% accurate.