I'm looking for a good overview book of the Julio-Claudian dinasty or 1st century Rome in general (secondary source).
Matyszak, Philip. 2006. The sons of Caesar: imperial Rome's first dynasty. London: Thames & Hudson.
Mellor, Ronald. 1988. From Augustus to Nero: the first dynasty of imperial rome. East Lansing, Mich: Michigan State University Press.
Roller, Matthew B.,, 1966-, author. 2016. Constructing Autocracy : Aristocrats and Emperors in Julio-Claudian Rome /. Princeton: Princeton University Press.
Sittig, Florian. 2018. Psychopathen in Purpur: Julisch-claudischer Caesarenwahnsinn und die Konstruktion historischer Realität. Thesis (doctoral)--Freie Universität, Berlin, 2016.
Suetonius, The Twelve Caesars (Any translation will do; check the Penguin options).
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Ginsburg, Judith. 2006. Representing Agrippina: constructions of female power in the early Roman Empire. Oxford: Oxford University Press. http://site.ebrary.com/id/10233626.
Scullard, H. H. 1982. From the Gracchi to Nero: a history of Rome from 133 B.C. to A.D. 68. London: Methuen.