APA

George R. Walther, MC GRAW-HILL, .MARKETING AL REVES. Colombia: MCGRAW-HILL.

Chicago

George R. Walther, MC GRAW-HILL, .MARKETING AL REVES. Colombia: MCGRAW-HILL.

Harvard

George R. Walther, MC GRAW-HILL, .MARKETING AL REVES. Colombia: MCGRAW-HILL.

MLA

George R. Walther, MC GRAW-HILL, .Colombia: MCGRAW-HILL. .