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Had this situation come up in my last game - Alice the wizard lends Bob (also a wizard) her spellbook, which contains "Summon Cacodaemon", a spell found only in the "Horsemen of the Apocalypse" source book. While the spell is listed as available in Additional Resources, Bob hasn't bought that source book yet. Similarly, Bob has a spell you can only have access to through a chronicle, a chronicle that Alice doesn't have.
Can Alice and Bob copy these spells into each other spellbooks? They'd obviously be unable to memorize them (cast them through an arcane bond, etc.) until they acquired the sources, but do they need the sources to add them to their spellbooks?
(I'm kinda hoping they can, since otherwise we'd be forcing Bob to buy the source book on the spot.)
