The aim of this study was to investigate the nature of the processes involved in working memory (WM) retrieval by distinguishing between recollective (direct access) and non-recollective (reconstruction) recall. To this end, the trichotomous theory of recall (Brainerd et al., 2009) was applied to young adults' recall performance in a complex span task in which word lists were presented in three successive study-test trials. In three experiments, factors known to affect WM performance were manipulated, such as the cognitive load (CL) of the concurrent task and the involvement of long-term memory (LTM) knowledge through the associative relatedness of the memory items and the temporally spaced presentation of memory lists. The application of the trichotomous theory of recall proved effective and established that both recollective and non-recollective processes support WM recall, though recollective processes are predominant. The detrimental effect of increased CL on recall performance appeared to result from a reduction in direct access, while leaving reconstruction unaffected. Two manipulations aimed at increasing the involvement of LTM in recall had different effects on retrieval processes. Associative relatedness favored direct access, while spaced presentation reduced it. The implications of these findings for our understanding of the relationships between LTM and WM and for WM theories are discussed.