The files are: apalike-plus.sty - This is for people who want something like apalike.sty (perhaps because they are using apalike.bst), but who want the extra features described above. authordate1-4.sty - This is for people who are using one of the BibTeX author-date style files authordate1.bst, ... , authordate4.bst. It redefines []and thebibliography, and also defines a command such that if [] gives "(Smith, 1970)", gives "(1970)".