There will be other small sections in many Ancient Greece books so check the index at the back of the book. Look for 'plague' or 'Athenian plague'.
Online encyclopaedias are great for short, concise and reliable information. It may be best to access these articles from the Online encyclopaedias page through the Hale portal. Don't forget Britannica has ready made citations for you to use.
It is important to provide evidence of using a variety of reliable resources. Use the online Reference Generator available through the Portal to create your citations. Make sure you alphabetically sort them afterwards.
A sample bibliography for 3 resources suggested on these pages would look like:
Bury, JB & Meiggs, R 1978, A history of Greece: to the death of Alexander the Great, Macmillan Press, London.
Pericles 2019. Britannica School. Retrieved 20 May 2019, from https://school.eb.com.au/levels/high/article/Pericles/59246
‘The Plague at Athens, 430-427 BCE’ 2016, in Ancient History Encyclopaedia, accessed 20 May 2019, <https://www.ancient.eu/article/939/the-plague-at-athens-430-427-bce/>.