Niemiec, Mateusz. 2018. “The Mechanism of Settling Tax on Goods and Services in the Relationship Between the Investor – Main Contractor (buyer of Construction Services) and Another Contractor in the Light of Legal Changes in Force from January 1, 2017”. State and Local Government Budget Law 6 (3):89-113. https://doi.org/10.12775/PBPS.2018.018.