It depends on the journals, if your going for nature or palgrave journals you can see the journal date in top of the page before the article heading.
were is the published date
You can go to www.agentquery.com and type in publishing agents
To find a reliable and legitimate publishing agent online, you should look into Publishers Marketplace at www.publishersmarketplace.com. There you will find a list of publishing agents as well as their contact information so that you can further investigate whether someone will be of help to you and your piece.
An online magazine article is the same as an article in a paper magazine except you can find it online, usually through the magazine's own website or through an article aggregation site. You can find an example through the given link.
Most dates are prominently displayed on the article at the top or the bottom. If the date is not on the article, you can email the writer for more details.
In order to find out more about publishing books one could visit the local library to find a book about the subject, or speak to the staff at a publishing company to get their advice. Alternatively there are online options such as Createspace.
You're going to have to find the article online but you can still cite the work.
Well most of the time you can find it on back of the cover but some times it's on the back cover
To find an article that was posted on the Yahoo site yesterday, you need to access the site and look at the date.
You can typically find the publisher of an online news article by looking for the byline, which usually includes the author's name and often the name of the publication or news organization. Additionally, you can scroll to the bottom of the article to find information about the publisher or check the "About" section of the news website.
http://www.naturalnews.com/002039.html this link will take you to an article that talks about glycogen levels. There are lots of articles out there. I read this article and I find it very interesting.
If the news article originates with someone other than the media that is publishing it, the source will be listed at the very top of the article. If the person writing the article obtained the information for a portion of the work from someone else, they will likely credit them as they present the obtained portion.
He is an Australian concert pianist. You can find a wikipedia article about him online.