The dependence of performance in school on classroom temperature /
Holmberg, I.
Wyon, D.
Elvin, P. J.
Garston :  Building Research Station, 
1968.
[Reprinted from]: Report no. 55 of the Pedagogiskpsykologiska Institutionen, Lärarhögskolan Fack, Malmo, 23 Oct. 1967.