Cramér, Harald. "Index". Mathematical Methods of Statistics (PMS-9), Volume 9, Princeton: Princeton University Press, 1946, pp. 571-576. https://doi.org/10.1515/9781400883868-017
Cramér, H. (1946). Index. In Mathematical Methods of Statistics (PMS-9), Volume 9 (pp. 571-576). Princeton: Princeton University Press. https://doi.org/10.1515/9781400883868-017
Cramér, H. 1946. Index. Mathematical Methods of Statistics (PMS-9), Volume 9. Princeton: Princeton University Press, pp. 571-576. https://doi.org/10.1515/9781400883868-017
Cramér, Harald. "Index" In Mathematical Methods of Statistics (PMS-9), Volume 9, 571-576. Princeton: Princeton University Press, 1946. https://doi.org/10.1515/9781400883868-017
Cramér H. Index. In: Mathematical Methods of Statistics (PMS-9), Volume 9. Princeton: Princeton University Press; 1946. p.571-576. https://doi.org/10.1515/9781400883868-017