In the actual HSC, you don't need to provide page number. It's probably better to contextualize because the markers won't necessarily know off the top of their head what you're referring to. For something like Shakespeare, act/scene number can be useful to provide context, (i.e. Shakespeare immediately shows in Act 1 Scene 2 the preoccupation with deception, using repetition as Hamlet proclaims 'Seems madam? nay it is! I know not 'seems'') but it is no means necessary. However, school marking is a different beast, so check with your teacher or head of department.