Sarmatian Cavalry

[Alanus]

Salve,

Here are a few other books on the subject, most dealing with pre-Sarmatian as well. Several give the "big picture" background, particularly where the culture came from and how it flourished across the steppes:

Brzezinki & Mielczarek, The Sarmatians
Jettmar, Art of the Steppes
Anthony, The Horse, the Wheel, and Language
Kelekna, The Horse in Human History
Aruz, Alekseev, et al, The Golden Deer of Eurasia

also the old guys:
Herodotus
Amianus Marcellinus
Tacitus

Books devoted to Sarmatians and Alans/Massagetae are too few, and I doubt the trend will change until the public (and students) realize that ealry steppe cultures gave us more relevant and lasting traditions than the Romans did.