Walford, J., Lammers, B., Schilling, R. S. F., Hoven, D. v. d., Genderen, v., & Veen, Y. G. v. d. (1966). Diurnal Variation in Ventilatory Capacity: An Epidemiological Study of Cotton and other Factory Workers employed on Shift Work.

Walford, Joan, B. Lammers, R. S. F. Schilling, D. van den Hoven, van Genderen, a Y. G. van der Veen. Diurnal Variation in Ventilatory Capacity: An Epidemiological Study of Cotton and Other Factory Workers Employed On Shift Work. 1966.

Walford, Joan, et al. Diurnal Variation in Ventilatory Capacity: An Epidemiological Study of Cotton and Other Factory Workers Employed On Shift Work. 1966.