Cite the scholarly edition first, then The Greek Library URL, the CTS URN, the corpus release and the access date.
Format
Author. Title. Edited by Editor. Printed source, date. The Greek Library, corpus 2.3.0. CTS URN. URL.
Example
Homer. Ἰλιάς. Edited by David B. Monro and Thomas W. Allen. Oxford: Clarendon Press, 1908–1920. The Greek Library, corpus 2.3.0. urn:cts:greekLit:tlg0012.tlg001.local001. https://thegreeklibrary.pages.lisn.upsaclay.fr/works/tlg0012.tlg001.local001/.
For a passage, add the edition’s own reference (book, line…); where only a local reference exists, keep the full CTS URN and the page URL. A repository-level citation is available as CITATION.cff.