The meaning of the word “citation” is a quotation from or reference to a book, paper, or author, especially in scholarly work. (http://www.oxforddictionaries.com) Literally, citing means to rely on different resources and use ideas, images, theories, words etc. from those resources. The idea of citing is to avoid plagiarism and promote the research work. Citing a source is a strength of writing and it supports information, which is provided in the work. Moreover, it brings evidence to your work and shows that proper research has been done towards the written work. Citing has different formats like APA, ACS, MLA, MHRA etc. However, it has common elements like author, article title, resource title, volume, date of publication and pages. The common rules of citing and formatting gives to the whole community clear understanding of using somebody’s ideas, theories and images. For example, looking at the reference you can easily define the type of resource it could be either book or article. The difficulties of citing is to follow the particular style of formatting.