were revised and merged into a single work, constituting the third edition of the standard.

The fourth edition was published in June 2021 as ISO 690:2021.

Usage

In academic publishing, compliance with ISO 690 is often less than rigorous.

Examples of citation (ISO 690:1987)

ISO 690 is copyrighted and not free for distribution. The application of versions preceding the current edition is not considered a fault.

; Monographs:
: Lominandze, DG. Cyclotron waves