The Slavic people as a whole - maybe not. Some Slavs - yes, most likely (especially in Ukraine, although the Polish nobles also used to pretend Sarmatian heritage).
As for books - for the Bulgarian case you'd find various books with various (and often quite different) conclusions (mostly old Turkic propaganda, considering the modern Iranic theory and autochtonic thesis haven't yet left our borders too much). And I don't think there's ever been one book/study that would systemize and show all the various theses and theories with their pros and cons objectively. And for the Slavic ethnogenesis - I have no idea, though I'm sure finding books on it would be easier.