MARY HOPKIN: versions by latinamerican artists

 Original: MARY HOPKIN ( U.K. ) - KNOCK; KNOCK WHO'S THERE ? ( composers = compositores: JOHN CARTER - GEOFF STEPHENS ) ( march 20, 1970 = 20 marzo 1970 ). Version = versión: ESTELA NUÑEZ ( México ) - PAM, PAM, QUIÉN ES ( KNOCK, KNOCK, WHO'S THERE ? ) ( spanish lyric = letra en español: A. LOCKE ) ( 1971).