Need your opinion of a Source found on page Campus_police

I was hoping I could get your expertise on whether this is a credible source. I noticed this page has a link to an amazon listing that I feel could be seen as advertising this book for profit. If the source is the book, shouldn't the proper citations would be required (page numbers, etc)? Your opinion would be appreciated. Source 4 links to https://www.amazon.com/College-Officer-Defensive-Tactics-Training/dp/1520574924 Thanks so much.--Sadsignal (talk) 09:58, 30 July 2018 (UTC)

Hey Sad thanks for reaching out. That campus police page badly needs a rewrite so glad you are having a look over it. So I've seen Amazon links to books, but it usually is used when it is a author's page and they are linking to the book just to show that the book was written. If this is used as a citation which it seems to be used, then the link to the book is wrong. You are very correct.Sgerbic (talk) 15:12, 30 July 2018 (UTC)
Thanks so much. The campus police page is on my to-do list and I wanted to check this source first before I started working on it. Your help is appreciated. --Sadsignal (talk) 10:23, 1 August 2018 (UTC)