APA 6th no date and multiple same author no date
When there is no date entered for a reference, Refworks should automatically default to n.d. and when there are more than one publication in the same year with the same author RCM should cite as per APA, i.e. Surname, n.d.-a; Surname, n.d.-b.
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Date field accepts free text such as n.d. since July 2019. Author differentiation by various methods, including a/b/c suffix, is supported since April 2020. For details please refer to the release notes: https://knowledge.exlibrisgroup.com/RefWorks/Release_Notes/RefWorks_Release_Information/2020_RefWorks_Release_Information