a research the works original purpose and historical background.

One morning when Ali was absorbed in prayer in a mosque, Ibn-Muljim stabbed him with a poisoned sword. On the 20th of Ramadan, 40 A.H., died the great Companion. -wikipedia
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Non-experimental research is done by examining data from other research studies and compiling observations. There are no original experiments conducted in this type of research. Experimental research is done by conducting original experiments.

The words, primary research, mean collecting the original primary data about a given subject. Secondary research follows primary research by branching out in a different manner.

APA provides a way to document the original research as summarized by a later author.