Which modes of information literacy instruction (ILI) work best in asynchronous online courses? Recent national trends and COVID-19 have made it critical to answer this question, but there is little research comparing different modes of ILI specifically in asynchronous contexts. This multi-year study employed 5 different modes of ILI in different sections of an asynchronous online anthropology course and compared the modes' effects on students' coursework. Ethnographic analysis of students' bibliographies revealed nuanced changes to students' approaches to searching and source-selection. These findings can inform librarians' development of ILI curricula and pedagogy for the unique circumstances asynchronous instruction presents.