Integer group determinants for three of the non-abelian groups of order 16

For any positive integer n, let \(\textrm{C}_{n}\) ${\text{C}}_n$ be the cyclic group of order n. We determine all possible values of the integer group determinants for the non-abelian groups \(\textrm{C}_{2}^{2} \rtimes \textrm{C}_{4}\) ${\text{C}}_2^2⋊{\text{C}}_4$ , \(\textrm{C}_{4} \rtimes \textrm{C}_{4}\) ${\text{C}}_4⋊{\text{C}}_4$ and \(\textrm{C}_{8} \rtimes _{5} \textrm{C}_{2}\) ${\text{C}}_8{⋊}_5{\text{C}}_2$ of order 16.