Siemens, R. E., Stickney, W. A., & Good, P. C. (1975). Recovery of nickel and cobalt from low-grade domestic laterites. U.S. Dept. of the Interior.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSiemens, R. E., William Albert Stickney, और P. C. Good. Recovery of Nickel and Cobalt from Low-grade Domestic Laterites. Washington, D.C.: U.S. Dept. of the Interior, 1975.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSiemens, R. E., et al. Recovery of Nickel and Cobalt from Low-grade Domestic Laterites. U.S. Dept. of the Interior, 1975.
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