The origins of reproductive isolation in plants - Baack - 2015 - New Phytologist - Wiley Online Library
Reproductive isolation - Wikipedia
Speciation | Causes, Process, & Types | Britannica
Types of Prezygotic Isolation Mechanisms
Natural selection - Biology Online Dictionary
Patterns of Hybrid Seed Inviability in the Mimulus guttatus sp. Complex Reveal a Potential Role of Parental Conflict in Reproductive Isolation - ScienceDirect