APA

Macdonald (John) ;Piggott (John), . (1992). Global Quality. : .

Chicago

Macdonald (John) ;Piggott (John), . 1992. Global Quality. : .

Harvard

Macdonald (John) ;Piggott (John), . (1992). Global Quality. : .

MLA

Macdonald (John) ;Piggott (John), . Global Quality. : . 1992.