Autor:	Quinn, R.C., Ward, B., Watterson, J., Waddington, C.H., Bacon, E.N., Slayton, W.L., Haar, C.M., Llewelyn-Davies, Lord, Monod, J., Campbell, C.C., Smallwood, F., Mead, M., Hellyer, P.T.
Zdroj:	Ekistics, 1971 Oct 01. 32(191), 301-303.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/43619246