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Cronb.adt, L.J. and 'urby, L. 'How "'" should Masure • chan,.' <>r Ilhould

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'Ilycbolo,lcal hlleUn. 1970. Vol . . . 7a. pp. 61-80.

Lord.

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"Tbe Mallure_nt of ,rovth."' E<!ucatlo.... 1 and rll:rc:bolo&ical

~asur"'lIt. ItS6. Volu. . 16. pp.421-4l7.

Lord. 1'.1'\. " u n her "robl. . . In the "."ur"'_nt <>f Irmnh."'

&ducuto....1 and ,..",bolo.teal ~allur_Ot. 19S'. 1I0lu. . 1& pp.

4J7-451.

Ilc~. .r. Q. "On-,rovtb Ma,ure. . nt.' !:ducatto...,1 alld P':rc:hotolllcal

""'asur"'. . nt. 1951. 1101..- 111, pp. 47-SS.

Stat"" R.E. and Wardrap. T.L. Gatn llCar", errOtll tn petraraanc:.

eanttactlna. Unl~arllty af I111DOll. 110 data (1l.1aaOlraph). 1915.