Acknowledge the author of the source and then discuss the details of the specific source. It can be done through paraphrasing and quoting from the original source. The method of quoting first and then explaining what that specific passage is can also be effective. Quoting is a harmless way of integrating a source into ones work. The citation is very important as well. It is important to indicate page numbers and even line numbers for the sake of references. Another good method would be introducing the author and then following it with a brief summary (Alred, 2003, p. 153).
An example would be: Fear Itself: Depression Life is written by Robert McElvaine and discusses how the Great Depression has hit Americans. It talks about how Americans in the early 20th century battle with starvation and unemployment, which affected a lot of Americans. Soon, the situation helped them change to become a better person. The country has suffered the Great Depression in the 1930s. People got mixed perceptions in this difficult time though (McElvaine, 1993, p. 23). Notice how the paragraph started with the authors name and immediately gives a background of the article he wrote.
The importance of doing this right away in the first paragraph is for the sake of coherence in writing. With proper citation, paraphrasing and summarizing research sources can be integrated into another persons writing without plagiarism.
References Alred, G. (2003). Handbook of Technical Writing. Michigan: St. Martins Press. Lester, J. (2005). Research Paper Handbook: Your Complete Guide. California: Good Year Books. McElvaine, R. (1993). The Great Depression: America, 1929-1941. New York: Times Books.