Ineed pronouncing đ/đ correctly, i constantly mess it up. any serbo-croatian speakers, students, teachers that can ?

It's just like a 'd' as in 'schedule'.

'dž' (because you might have problems distinguishing them) sounds more like a 'j' as in 'just', but it's tougher :))

the answer is: apostrophe and allusion.

apostrophe refers to a poetic technique that is used to address an absent individual or an abstract idea/being. allusion on the other hand is a poetic technique that being done by making an indirect reference to other person with a high level of significance (could be historically or culturally significant)