APA (7th ed.) Citation

Gilbreath, G. C. Active and Passive Signatures IV. SPIE Digital Library.

Chicago Style (17th ed.) Citation

Gilbreath, G. Charmaine. Active and Passive Signatures IV. SPIE Digital Library.

MLA (8th ed.) Citation

Gilbreath, G. Charmaine. Active and Passive Signatures IV. SPIE Digital Library.

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