Johnson, Henry M. Dialogue and the construction of knowledge in e-learning: Exploring students’ perceptions of their learning while using Blackboard’s asynchronous discussion board. European Journal of Open, Distance and E-Learning January 5, 2007 (2007) ISSN1027-5207http://www.eurodl.org/index.php?tag=120&article=151&article=251보관됨 2012-11-16 - 웨이백 머신
Gilfus, Stephen (2000년 11월 3일). “Blackboard Building Blocks”(PDF). 《Building Blocks Whitepaper》. 2017년 11월 14일에 원본 문서(PDF)에서 보존된 문서. 2011년 5월 9일에 확인함.
Johnson, Henry M. Dialogue and the construction of knowledge in e-learning: Exploring students’ perceptions of their learning while using Blackboard’s asynchronous discussion board. European Journal of Open, Distance and E-Learning January 5, 2007 (2007) ISSN1027-5207http://www.eurodl.org/index.php?tag=120&article=151&article=251보관됨 2012-11-16 - 웨이백 머신
Johnson, Henry M. Dialogue and the construction of knowledge in e-learning: Exploring students’ perceptions of their learning while using Blackboard’s asynchronous discussion board. European Journal of Open, Distance and E-Learning January 5, 2007 (2007) ISSN1027-5207http://www.eurodl.org/index.php?tag=120&article=151&article=251보관됨 2012-11-16 - 웨이백 머신