I have just posted my 1973 paper, "The Carrot and The Stick," on my website. It shows the development of my analysis of human associations as of 1972, when I wrote the paper. The table of associations presented was inadequate, so before my 1981 college textbook came out I added a third type of associations on the horizontal axis and rearranged that axis (to make it jibe with my analysis of satisfaction in terms of which I distinguish sanctions and inducements). But I still think the paper, which was published in the Michigan Academician in 1973, does a decent job of explaining a lot of my basic concepts.
I have also posted several other things that I wrote in the early 1970s that illustrate my groping for concepts with which to systematically think about associations.
All of these writings are on the Fundamental Concepts page.