@book{56,
	author = {Gravetter, Frederick J  and Wallnau, Larry B. },
	title = {Statistics for the behavioral sciences},
	publisher = {Wadsworth/Thomson Learning},
	year = {©2004},
	address = {Southbank, Vic. },
	edition = {6th ed., International student ed},
	note = {Includes bibliographical references and index}
}