* Literary texts: These include works by Roman authors such as Livy, Tacitus, Suetonius, and Cicero, as well as Greek authors such as Polybius, Plutarch, and Strabo. These texts provide a wealth of information on Roman history, politics, society, and culture.
* Inscriptions: These include public records, such as laws, treaties, and building dedications, as well as private inscriptions, such as墓志铭and funerary monuments. Inscriptions provide valuable information on a wide range of topics, including Roman law, religion, and daily life.
* Archaeological remains: These include ruins of Roman buildings, cities, and fortifications, as well as artifacts such as pottery, coins, and jewelry. Archaeological remains provide physical evidence for the study of Roman history and culture.
Secondary sources, such as textbooks, encyclopedias, and journal articles, can also be useful for a research paper on ancient Rome. However, it is important to use secondary sources critically and to always refer to primary sources whenever possible.