Search Primo for books on your topic. When you find a book that looks especially useful, click on its subject headings to locate more books on the same topic.
What are the subject headings for this book?
Other good sources for citation mining are published annotated bibliographies:
These e-journal collections provide access to many journals, but they are more limited in coverage compared to subject databases. In most cases, it's better to search subject databases to identify articles, and then use Primo to link to the materials in these e-journal collections. However, for interdisciplinary topics, these e-journal collections may be good places to start.