Articles without references

[Hassan Fayed]

Dear All,

I am preparing a research about the uses of polymer mud in high deviated wells. I have found many resources in the internet as:
1- www.rigzone.com
2- www.drillingmanual.com
3- www.petrowiki.com

The problem that some articles don't have references can I use them. In other meaning can I say that my reference is as example rigzone URL or do I have to take the references in the post

 

[shvet]

Referencing coding depends on local practices. More details = better tips.

https://apastyle.apa.org/style-grammar-guidelines/references/examples