APA (7th ed.) Citation

(1923). Harmsworth's wireless encyclopedia .. Harmsworth Encyclopedias.

Chicago Style (17th ed.) Citation

Harmsworth's Wireless Encyclopedia .. London: Harmsworth Encyclopedias, 1923.

MLA (9th ed.) Citation

Harmsworth's Wireless Encyclopedia .. Harmsworth Encyclopedias, 1923.

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