Abbs, B., & Freebairn, I. Opening strategies: Workbook.
Cita Chicago (17th ed.)Abbs, Brian, i Ingrid Freebairn. Opening Strategies: Workbook.
Cita MLA (8th ed.)Abbs, Brian, i Ingrid Freebairn. Opening Strategies: Workbook.
Atenció: Aquestes cites poden no estar 100% correctes.