Hukum jajaran genjang (Indonesian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Hukum jajaran genjang" in Indonesian language version.

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Cantrell, Cyrus D. (2000). Modern mathematical methods for physicists and engineers. Cambridge University Press. hlm. 535. ISBN 0-521-59827-3. if p ≠ 2, there is no inner product such that ${\sqrt {\langle x,\ x\rangle }}=\|x\|_{p}$ because the p-norm violates the parallelogram law.
Saxe, Karen (2002). Beginning functional analysis. Springer. hlm. 10. ISBN 0-387-95224-1.