LANGSTON WILLIAM, . (2011). RESEARCH METHODS LABORATORY MANUAL FOR PSYCHOLOGY.3RD ED. : WADSWORTH CENGAGE LEARNING AUSTRALIA.
LANGSTON WILLIAM, . 2011. RESEARCH METHODS LABORATORY MANUAL FOR PSYCHOLOGY.3RD ED. : WADSWORTH CENGAGE LEARNING AUSTRALIA.
LANGSTON WILLIAM, . RESEARCH METHODS LABORATORY MANUAL FOR PSYCHOLOGY.3RD ED. : WADSWORTH CENGAGE LEARNING AUSTRALIA. 2011.
