Cramér, Harald. "Chapters 1–3. Sets of Points". Mathematical Methods of Statistics (PMS-9), Volume 9, Princeton: Princeton University Press, 1946, pp. 3-18. https://doi.org/10.1515/9781400883868-002
Cramér, H. (1946). Chapters 1–3. Sets of Points. In Mathematical Methods of Statistics (PMS-9), Volume 9 (pp. 3-18). Princeton: Princeton University Press. https://doi.org/10.1515/9781400883868-002
Cramér, H. 1946. Chapters 1–3. Sets of Points. Mathematical Methods of Statistics (PMS-9), Volume 9. Princeton: Princeton University Press, pp. 3-18. https://doi.org/10.1515/9781400883868-002
Cramér, Harald. "Chapters 1–3. Sets of Points" In Mathematical Methods of Statistics (PMS-9), Volume 9, 3-18. Princeton: Princeton University Press, 1946. https://doi.org/10.1515/9781400883868-002
Cramér H. Chapters 1–3. Sets of Points. In: Mathematical Methods of Statistics (PMS-9), Volume 9. Princeton: Princeton University Press; 1946. p.3-18. https://doi.org/10.1515/9781400883868-002