(1917). The Original Guckert's chords for the ukulele at sight: Without notes or teacher. Union Music.
芝加哥风格引文The Original Guckert's Chords for the Ukulele at Sight: Without Notes or Teacher. Toledo: Union Music, 1917.
MLA引文The Original Guckert's Chords for the Ukulele at Sight: Without Notes or Teacher. Union Music, 1917.
警告：这些引文格式不一定是100％准确.