Helwich, O., & Baring, J. L. (1936). Practical infra-red photography. Fountain Press.
Chicago Style (17th ed.) CitationHelwich, Othmar, and J. L. Baring. Practical Infra-red Photography. London: Fountain Press, 1936.
MLA (8th ed.) CitationHelwich, Othmar, and J. L. Baring. Practical Infra-red Photography. Fountain Press, 1936.
Warning: These citations may not always be 100% accurate.