Ewan, V. J., West, G., & Temporal, J. (1981). Reproducibility of joint spacing measurements in rock. Transport and Road Research Laboratory.
Lua i Stíl Chicago (17ú heag.)Ewan, V. J., G. West, agus J. Temporal. Reproducibility of Joint Spacing Measurements in Rock. Crowthorne, Berkshire: Transport and Road Research Laboratory, 1981.
Lua MLA (9ú heag.)Ewan, V. J., et al. Reproducibility of Joint Spacing Measurements in Rock. Transport and Road Research Laboratory, 1981.
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