Kjellman, W., Kallstenius, T., & Wager, O. (1950). Soil Sampler with metal foils: Device for taking undisturbed samples of very great length.
Chicago-Zitierstil (17. Ausg.)Kjellman, W., Torsten Kallstenius, und O. Wager. Soil Sampler with Metal Foils: Device for Taking Undisturbed Samples of Very Great Length. Stockholm, 1950.
MLA-Zitierstil (9. Ausg.)Kjellman, W., et al. Soil Sampler with Metal Foils: Device for Taking Undisturbed Samples of Very Great Length. 1950.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.