In writing and especially in research papers, it is common to use the ideas proposed by other authors in external sources in order to explain, support or present own ideas and in order to develop the main point of the research or answer to the question on it. This includes summarizing ideas, quoting them or paraphrasing them in different sections of the document; additionally, in any of this cases the student or writer will need to give credit to the author not only because it is ethical to recognize certain ideas are not won ideas but to show the reader your ideas have been also proposed by other authors and because this is part of academic style. Therefore it is false it is not necessary to give credit for ideas if these are included in the main body of the research paper as ideas from different authors need to be credited no matter in which section they appear.
the theme of Moby Dxck is friendship through the special bond between the narrator of the novel, Ishmael, and Queequeg, a man native to an island of cannibals.