Parthian and Sassanid Armies

Nope - you compared him to Menzies, not Phrossack.

Phrossack only claimed that he is supposedly unprofessional. And there is a difference between "unprofessional" and "insane".

Phrossack said:

Not sure about the other sources, but Kaveh Farrokh is a nationalistic and unprofessional joke, and "Rome's Enemies" is Osprey, which while it has wonderful illustrations is not always that accurate.

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I must agree with you because all the information he provide was actually Internet information and yield no academic value at all.

Domen said:

But Kaveh Farrokh's book is not absurd, contrary to Gavin Menzies' book. So what's the point?

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If you are looking for serious academic research, then Kaveh Farrokh's book is not your choice.

But if you wish, i may introduce you to David Nicolle's Sassanian armies: The Iranian Empire Early 3rd to Mid-7th Centuries AD.

Or perhaps a more serious book by Professor Mohsen Zakeri Sasanid Soldiers in Early Muslim Society: The Origins of 'Ayyaran and Futuwwa.

If you're looking for Arabic source, The History of Al-Tabari: The Sasanids, the Lakhmids, and Yemen is your primary choice.