how to reference journal

To be made up of:
In an effort to simplify journal referencing, as long as the journal reference provides enough bibliographic information for the article to be located, other elements no longer need to be included, for example [Online], database title and URL.

If you are referencing the name of a journal, the journal name would be in italics.
Example:
Smith and Tennant, authors of the article, “Time travel paradoxes in modern films,” observed .

The Royal Society of Chemistry have a specific referencing style that we use across all our journals, as it ensures that all references are given accurately, clearly and with sufficient detail. Reading this guide will help you format references, notes and footnotes using the Royal Society of Chemistry’s house style. It is based on the advice that we offer to authors wishing to publish their research in our journals. It’s always worth checking with your university department what referencing style they recommend though, and if they have specific guidelines they want you to follow.
This guide is part of a collection of resources that we have produced for students using journal articles. You can find more resources in our Reading and understanding journals resource collection.

Sometimes an author writes about research that someone else has done, but you are unable to track down the original research document. In this case, only include the source you did consult in your references because you did not read the original document. Use the words ‘cited in’ in the in-text citation to indicate you have not read the original research.
(Fong, cited in Bertram 1997)

With this in mind, we suggest you reference both of these formats as you would reference journal articles. You can insert [letter to the editors] or [editorial] in square brackets, after the title. With the rest of the reference, it will enable your reader to track back to the original article.
There are no examples for referencing either of these format types in the APA Publication Manual or in the APA Style Blog. There is, however, a reference to letters to the editor in the first chapter of the Publication Manual. Here, the manual refers to letters as ‘Other Types of Articles’ (American Psychological Association, 2010, p.11).

References:

http://libanswers.walsh.edu/faq/147825
http://www.rsc.org/learn-chemistry/resource/res00001664/how-to-reference-using-the-rsc-style#!
http://libguides.scu.edu.au/harvard/secondary-sources
http://answers.library.curtin.edu.au/faq/121116
http://libguides.ioe.ac.uk/c.php?g=482485&p=3299866