How do sorcerers gain spells from other lists?

[PreacherJeremy]

It says sorcerers normally take spells from the sorcerer/wizard spell list, but can learn other spells with some study. How does this work, and what is ment by study?

[Adjoint]

Not counting the bloodline spells, which may be from another spell list than sorcerer/wizard, spells can be researched:
Research and Designing Spells