Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Chi Tu:

"

J.L. Meons (1937) believed that early Srivijaya was located in Kelantan[1] and K.A. Nilakanta Sastri (1949) supported the idea.[2] The Kelantan theory may not be far-fetched, since Chinese Sui Dynasty annals of the 7th century describe an advanced kingdom called Chi Tu or Raktamrittika (as in Kelantanese history) as being in Kelantan, which the name was later changed to "Sri Wijaya Mala". The founding of Sri Wijaya Mala was 667 BC with its capital called "Valai", and it was situated along the upper Kelantan river of Pergau, known for its rich gold mines. It was until 570 BC that the kingdom changed its name to Sri Wijaya.[3]