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General inquiry

You may send inquiry email(s) directly by clicking here. We are a very small team for a publication of our size. We are human and we occasionally make mistakes. We gladly welcome criticism from our readers. If there’s validity in a complaint about some content we’ve written, we will take it to heart and act upon it.


Defective units

If the printed book is defective or damaged on arrival, please contact the respective distributor to make an arrangement for return. We only develop and publish contents, that is why we are not able to handle shipment and return directly.


About privacy

Our server system may collect device-specific information such as your hardware model, operating system version, unique device identifiers, and mobile network information. It may also automatically collect and store certain information in server logs, such as your search queries, internet protocol address, and cookies that may uniquely identify your browser. And it may store information locally on your device using browser web storage and application data caches.

Certain functions of our web site may require that you register as a member. We do not sell the registration information to any third party.


Investor inquiry 

Investor inquiry please refer to this link: 


Report an error 

Please let us know if an order link to any of your desired products is not working.