The Gruda Boljevića tumulus belongs to the Copper Age.
See:
- Mile Baković, The Princely Tumulus Gruda Boljevića Podgorica, Montenegro. Proceedings of the International Conference held in Udine, May 15th-18th 2008 in: Ancestral Landscapes. Burial mounds in the Copper and Bronze Ages (Central and Eastern Europe - Balkans - Adriatic - Aegean, 4th-2nd millennium B.C., Maison de l’Orient et de la Méditerranée, Lyon 2011, pp. 375-381 - http://www.persee.fr/doc/mom_2259-4884_2012_act_58_1_3477
- Blagoje Govedarica, Grab- und Opferfunde aus dem Hügel Gruda Boljevića in Montenegro (erste Hälfte des 3. Jahrtausend v. Chr.), in: Panta Rhei (Festschrift Pavuk), Studia Archaeologica et Mediaevalia, Tomus XI, Bratislava 2010, pp. 179-188.
- Mitja Gustin, Zdravka Hincak: Gruda Boljevića – Kneževska humka Kasnog Bakarnog doba. Princely grave tumulus of the late Copper Age (summary), in: Podgorica. Praistorijske humke i srednjovjekovne nekropole. Gruda Boljevića, Podgorica 2015, pp. 15-36