1
Published 1981.
...SUS 23...

Report Number(s): APA 316 RTS 10 SUS 23

Link to full text
2
Published [1983]
...SUS 167...

Report Number(s): APA 23 APA 962 SUS 167

Link to full text
3
Published [1984?]

Report Number(s): APA 4153 RTS 23 (draft)

Link to full text