STEPHENS RYAN K. (2008). SAMS TEACH YOURSELF SQL IN 21 DAYS. TECHMEDIA.
芝加哥风格引文STEPHENS RYAN K. SAMS TEACH YOURSELF SQL IN 21 DAYS. NEW DELHI: TECHMEDIA, 2008.
MLA引文STEPHENS RYAN K. SAMS TEACH YOURSELF SQL IN 21 DAYS. TECHMEDIA, 2008.
警告：这些引文格式不一定是100％准确.