Aspect
Links
Tense and Aspect
presentation
Verb Aspect
Rick Harrison's classic
Aspect in Russian: A Tutorial
Notes on Aspect in English
1. A two-dimensional analysis of lexical aspect
The Poor Man's Porter (Synopsis of chs. 1-5 of *Verbal Aspect*)
is a historical overview of several papers and books on Aspect
Chapter 3: Verb Phrases, Tense, and Aspect
is a general text on verbs, though only with English examples
Books etc.
Comrie: Tense
Comrie: Aspect