There has been a great deal of interest in second language vocabulary studies regarding the potential of reading as a source of incidental vocabulary learning. More recently, several studies have also focused on comparing reading with other input modes, such as listening, or reading-while-listening. Among these studies there are two -- Brown et al. (2008) and Vidal (2011) -- that have been extensively cited because of the evidence they provided regarding the differential effects of reading versus listening in promoting incidental vocabulary gains. The present study presents different arguments for replication of these two original studies as well as specific ideas on how such replications could be conducted.