Guilford, J. P. (1954). Psychometric methods/2e (2nd ed.). McGraw-Hill.
Dyfyniad Arddull ChicagoGuilford, J. P. Psychometric Methods/2e. 2nd ed. Bombay: McGraw-Hill, 1954.
Dyfyniad MLAGuilford, J. P. Psychometric Methods/2e. 2nd ed. McGraw-Hill, 1954.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.