Du, G. (2011). Mastering SQL queries for SAP Business One: Utilize the power of SQL queries to bring Business Intelligence to your small to medium-sized business. Packt Enterprise Pub..

Du, Gordon. Mastering SQL Queries for SAP Business One: Utilize the Power of SQL Queries to Bring Business Intelligence to Your Small to Medium-sized Business. Birmingham, U.K.: Packt Enterprise Pub., 2011.

Du, Gordon. Mastering SQL Queries for SAP Business One: Utilize the Power of SQL Queries to Bring Business Intelligence to Your Small to Medium-sized Business. Packt Enterprise Pub., 2011.