APA Edition Citation

Heel, A. C. S. v., & Velzel, C. H. F. (1968). What is light? Weidenfeld & Nicolson.

Chicago Edition Citation

Heel, A. C. S. van, and C. H. F. Velzel. What Is Light? London: Weidenfeld & Nicolson, 1968.

MLA Edition Citation

Heel, A. C. S. van, and C. H. F. Velzel. What Is Light? Weidenfeld & Nicolson, 1968.

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