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by Spielberger, Walter J.
by Spielberger; C. D.
by Spielberger,Charles D.
by Michael Potegal; ?Gerhard Stemmler; ?Charles Spielberger
by Spielberger, Charles D.; Diaz-Guerrero, Rogelio
by Spielberger, Charles D.; Sarason, Irwin G.
by C. D. Spielberger
by Charles D. Spielberger