Here are some sources for the article, referenced in the Harvard referencing method:

Russell, B. (1945). A History of Western Philosophy. Simon & Schuster.
Long, A. A., & Sedley, D. N. (1987). The Hellenistic Philosophers. Cambridge University Press.
Inwood, B. (2005). Ethics and Human Action in Early Stoicism. Oxford University Press.
Annas, J. (1999). The Morality of Happiness. Oxford University Press.
Epicurus. (n.d.). In Stanford Encyclopedia of Philosophy. Retrieved from https://plato.stanford.edu/entries/epicurus/
In the text of the article, the sources could be cited as follows:

According to Russell (1945), Epicureanism is one of the most prominent schools of thought in ancient Greece.
Long and Sedley (1987) explain that Epicureanism is centered around the pursuit of pleasure and peace of mind.
Inwood (2005) argues that one of the key aspects of Epicureanism is its materialist view of the world.
Annas (1999) discusses Epicurus's belief that ethics should be based on the pursuit of pleasure and avoiding pain.
As noted in the Stanford Encyclopedia of Philosophy (n.d.), Epicurus rejected the idea of an afterlife and believed that death is a state of non-existence.
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