Spector, P. E. (1981). Research designs. Sage Publications.
Chicagoスタイル(17版)引用形式Spector, Paul E. Research Designs. Beverly Hills: Sage Publications, 1981.
MLA(9版)引用形式Spector, Paul E. Research Designs. Sage Publications, 1981.
警告: この引用は必ずしも正確ではありません.