Dear Christina Zenker,
You may consider looking up
A History of Indian Economic Thought
Author: Ajit K. Dasgupta, Rutledge
ISBN: 978-0-415-06195-7
Medieval Islamic Economic Thought: Filling the "Great Gap" in
European economics
S M Ghazanfar (ed), RoutledgeCurzon
ISBN: 0-415-2978-8
Arthasastra (science of wealth) by Kautilya written in fourth century
BC in India according to Amartya Sen is "almost certainly the first
book ever written with anything like the title 'Economics'". There
are a number of English translation available.
I have a copy of Chinese Economic Thought before the Seventeenth
Century, by Hu Jichuang; published by Foreign Language Press,
Beijing, 1984. But I do not know whether it is still available or not.
Best regards
Dipak Ghosh