See this example properly formatted in the QUT Cite tool.
Standard in-text citation examples are in Getting started - In-text citation.
How to reference material from Blackboard will depend on the source type. The common denominator is that the reference will end in a URL. The item below is a set of lecture slides by the unit coordinator.
Murray, Martin H. 2007. "ENB101 engineering mechanics: Week 2 lecture notes." Accessed March 26, 2008. http://blackboard.qut.edu.au/webapps/portal/frameset.jsp?tab_tab_group_id=_21_1&url=/webapps/blackboard/execute/courseMain?course_id=_28472_1.