PHOTOPERIODIC RESPONSES OF CERTAIN GREENHOUSE ANNUALS AS INFLUENCED BY INTENSITY AND WAVELENGTH OF ARTIFICIAL LIGHT USED TO LENGTHEN THE DAYLIGHT PERIODv. 11No. 2225–249
Withrow, R. B. and Benedict, H. M. 1936. "PHOTOPERIODIC RESPONSES OF CERTAIN GREENHOUSE ANNUALS AS INFLUENCED BY INTENSITY AND WAVELENGTH OF ARTIFICIAL LIGHT USED TO LENGTHEN THE DAYLIGHT PERIOD." Plant Physiology, 11, (2) 225–249.