Cita APA (7a ed.)

STEPHENS RYAN K. (2008). SAMS TEACH YOURSELF SQL IN 21 DAYS. TECHMEDIA.

Cita Chicago Style (17a ed.)

STEPHENS RYAN K. SAMS TEACH YOURSELF SQL IN 21 DAYS. NEW DELHI: TECHMEDIA, 2008.

Cita MLA (9a ed.)

STEPHENS RYAN K. SAMS TEACH YOURSELF SQL IN 21 DAYS. TECHMEDIA, 2008.