Publications by the same author in the same year
If using two publications from the same author which have been published in the same year, the reference should be written using the same author-date citation as for a single author along with a lower-case letter (a, b, c etc.) after the date to indicate the separate publications. The letters are assigned based on the order in which the citations appear in the text. The entries are listed accordingly in the Reference list.
(Krugman 2008a: 50; Krugman 2008b: 150.)
Krugman (2008a) suggests that economic recession ….
An example of text using multiple websites for Finnair from the same year
For airlines such as Finnair, profitability is vital as it is majority owned by the government of Finland and profitability is a requirement to receive funding from the government. (Finnair 2022a)
Additionally, the aviation industry has strong media value when anything abnormal happens which makes it more vulnerable to safety concerns, such as terrorism. (Finnair 2022b)