Your above query is giving compilation error, please try below query i think it will help you
SELECT d.Resource ,SUM(p.Hours) AS Hours ,m.[WeeksSundayToSaturday] ,DatePart(wk, m.[WeeksSundayToSaturday]) AS WeekNumber
FROM CalendarWeeks m
LEFT JOIN [TimeTracking] p ON (p.Date BETWEEN m.[WeeksSundayToSaturday] AND Dateadd(d,6, m.[WeeksSundayToSaturday])
RIGHT JOIN [DepartmentMembers] d ON d.Resource = p.CreatedBy
GROUP BY d.Resource ,m.WeeksSundayToSaturday