The Three Modern Methods for Documentat
1. PARENTHETICAL CITATION : A parenthetical citation acknowledges your sources by providing a reference to the author and page number of the sources within the text of your paper . The parenthetical citation follows the text that is being cited. Note that the citation comes before the period at the end of the sentences here are some examples of parenthetical citation.
If the name of the author is mentioned in the text the citation includes only the page number
according to a lunderstad " certain constant objectives can be found in american foreign policy "(1990,p.120)
2. FOOTNOTE: When footnotes are used , the parenthical citations are replace  with small , superscript numericals ( i.e raised slightly above the line) which are numbered consecutively throughout  the paper.Note that footnote numerals come after the period (or any other puntuaction mark) at the end of the sentence.
The foonote appaers at the buttom of the page , below the text of your paper
Geir lundestad    , the American "empire"(oxford:oxford up , 1990 )
3. ENDNOTE: Are constructed in the same manner as footnote. The only different is that the endnote are listed in sequence on their own page at the end of the page rather than appearing at the bottom of each  page. Your page of endnote should be titled "note" , centered at the top of the page.