1. Pliny the Elder, Natural History 33.16; Suetonius, Julius Caesar 10; Plutarch, Caesar 5; Cicero, Letters to his Friends 7.1
2. Augustus, Res Gestae 22–23
3. Tacitus, Annals 6.13; Josephus, Jewish Antiquities 19.24–27
4. Tacitus, Annals 14.15; Suetonius, Nero 21–25; Dio Cassius, History 73.16–17

1. Pliny the Younger, Letters 9.6
2. Ovid, Amores 3.2; Ovid, Ars Amatoria 1.135ff

1. Martial, On the Shows
2. Eusebius, Ecclesiastical History 5.1; Augustine, Confessions 6.8

1. Horace, Epistles 2.1.156ff
2. Pliny, Letters 7.24
3. Apuleius, The Golden Ass 10.30–32

1. Seneca, Letters 86.1-12; Lucian, The Baths
2. Seneca, Letters 56.1-2

Only some sources from Pompeii and Herculaneum can be found online. However, they can all be found in print in:

Cooley, Alison E. and Cooley, M.G.L, Pompeii and Herculaneum: A Sourcebook (London: Routledge, 2014)