How to find publishing date of a course?

I’m learning OSPF. Completed course: IPv4 Routing With OSPF by Keith. Then I came across course

CCNP Routing & Switching Technologies v2 which is also by Keith. It is mentioned like new in description. I thought it will cover some extra topics.

But this course seems like out dated. In authentication topic, he mentions like only clear text and MD5 possible but after 15.4 HMAC SHA is also supported.

Could someone please help me to figure out how to find the date of publishing. TIA