If it says rest 60 seconds, usually it means after each exercise. Waterbury in particular seems to advocate this method, as without enough rest you don’t get proper recruitment. Proper rest being about 90 seconds total, including time spent on the other exercise as long as it isn’t too similar.
Yeah, just remember a “superset” isn’t necessarily immediate. A1…A2 denotes a superset. A1…A2…A3 denotes a circuit. Regardless, rest periods should be specified seperately, because NO rest is generally just good for metabolic work.
With big circuits you can get away with less rest if the exercises are dissimilar