Gibbon, Edward. The Decline and Fall of the Roman Empire. pub. 1836. Website publication: June 7, 2008.
-While this is a massive text, it has been considered one of the best sources in English for a long time. Written over 150 years ago (or more), its perspective shows Rome as a powerful, successful Republic, then empire, while its fall is lamented.
Konstan, David. Clemency as a Virtue. Classical Philology. Vol. 100, No. 4. Oct. 2005.
Link - You may be able to read this (& other JSTOR texts) through logging in through the "Log in through your library" feature; also try to use your EMHS Google email and password account. It has opened in the past.
Parenti, Michael. The Assassination of Julius Caesar.
This text is linked through audio on this website already. It is a fascinating perspective that challenges traditional views on the Roman Republic. The author takes a clearly biased perspective siding with Julius Caesar against the opulent, brutal, and corrupt senate. It offers a refreshing take - and contrast - against the traditional, privileged bias of most original sources. Note its rhetorical power, thoroughness, and relentless attack on those traditional biased views of historians who had always taken side with the Roman senate.
Plutarch. The Parallel Lives of the Ancient Greeks and Romans/Lives of the Noble Greeks and Romans. c. 100 CE/AD. Direct link to section on Julius Caesar here.
-Written well over 150 years after Julius Caesar's assassination, this is arguably the most well known, read, and cited text on the lives of the ancient Greeks and Romans. It is also one of the earliest accounts in recorded history of some of the events, esp. the Roman Republic and empire.
Suetonius, Gaius Tranquillus. The Life of the Caesars (or it is also called The Lives of the 12 Caesars). AD 121. Link to the section on Caesar (posted here).
-This text, written nearly 200 years after Caesar's assassination, is considered a key, though racy and sensationalized, source. Detect the clear bias toward the senate as Suetonius clearly takes their side of things. Scholars, and Wikipedia, note the text omits very large events and/or details.
Titchner, Francis. To Rule Mankind and Make the World Obey. Barnes & Noble Pub. Utah State University. 2004.
-Titchener presents a thoroughly engaging lecture series that essentially takes a similar side as the older, traditional sources (Plutarch, Suetonius, Gibbon) and the Roman senate. She beautifully sums up Ancient Roman history from the time of the first kings, through the Republic and downfall of Caesar and the senate, and into a few centuries of the early Roman Empire. Drama crops up at every corner.