1. Regulation (EU) 2016/679 (General Data Protection Regulation).
Article 13 ('Information to be provided where personal data are collected from the data subject'): This article lists all required information. It includes recipients (13(1)(e)), data subject rights (13(2)(b)), and the right to complain (13(2)(d)), but does not mention "categories of personal data concerned."
Article 14 ('Information to be provided where personal data have not been obtained from the data subject'): This article, in contrast, explicitly requires providing "the categories of personal data concerned" under Article 14(1)(d).
2. Article 29 Working Party, 'Guidelines on Transparency under Regulation 2016/679' (WP260 rev.01), adopted on 11 April 2018.
Page 21, Table: The document provides a comparative table of the information requirements for Articles 13 and 14. It clearly indicates that "The categories of personal data concerned" is a requirement under Article 14 only, not Article 13.
3. Bygrave, L. A. (2020). Data Privacy Law: An International Perspective. Oxford University Press.
Chapter 7, Section 7.4.2 ('Duty to provide information'): This section discusses the transparency obligations under the GDPR, distinguishing between the information requirements for direct collection (Article 13) and indirect collection (Article 14), noting that the categories of data are only required for the latter.