Reference

baecker
@article{baecker,
 author = {Baecker, Ronald M.},
 title = {TIMELINES
Themes in the early history of HCI---some unanswered questions},
 journal = {interactions},
 volume = {15},
 number = {2},
 year = {2008},
 issn = {1072-5520},
 pages = {22--27},
 doi = {http://doi.acm.org/10.1145/1340961.1340968},
 publisher = {ACM},
 address = {New York, NY, USA},
 }