Krimmer, R., Prentza, A., & Mamrot, S. (2021). The Once-Only Principle: The TOOP Project. Springer Nature.
Chicago-čujuhus (17. p.)Krimmer, Robert, Andriana Prentza, juo Szymon Mamrot. The Once-Only Principle: The TOOP Project. Springer Nature, 2021.
MLA-čujuhus (9. p.)Krimmer, Robert, et al. The Once-Only Principle: The TOOP Project. Springer Nature, 2021.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.