APA (7th ed.) Citation

Penn, W. Liquid Crystals and Spatial Light Modulator Materials. SPIE Digital Library.

Chicago Style (17th ed.) Citation

Penn, William. Liquid Crystals and Spatial Light Modulator Materials. SPIE Digital Library.

MLA (8th ed.) Citation

Penn, William. Liquid Crystals and Spatial Light Modulator Materials. SPIE Digital Library.

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