Citations and References REFERENCES are collected in a list that embraces all sources that have been quoted in the text; and they are ordered either: Name-Date System : Alphabetically according the author’s name and publication date, The names of authors are written, succeeded by the dates of publication of the cited works in the text, between brackets, and which correspond to cited works bibliographic list, at the end of the thesis. E.g., ( Kroto , McDonald, and Osman 1985), (Raven et al. 1998 ) When a citation is done with more than one reference for the same piece of information, the separate citations are written consecutively, e.g., ( Kroto , McDonald, and Osman 1985 ) (Raven et al. 1998 ) in a chronological order. The bibliographic list is entitled under the heading “REFERENCES”. The references are ordered alphabetically, according to the family name or surname, for all sources; and the ordering should be chronological (the older than the latter) for the same author, whether sole or with others. Numeration System : In the same order of citing in the document. The references are numerated consecutively in the text, between brackets, and according to their appearance for the first time in it, starting with number [15]. If the use of the same reference is repeated, it should not be given a new number but rather assigned the original referential one. When a citation is done with more than one reference for the same piece of information, the numbers of references are mentioned in an ascending ordering and are separated by commas [2,5,8]. If the numbers are in the form of a consecutive series of three or more references, a dash is written between the first and last one, [3-5,10] See The Guidelines of writing References 38