Hickel, E. Das Kaiserliche Gesundheitsamt (Imperial Health Office) and the chemical industry in Germany during the Second Empire: Partners or adversaries? / Erika Hickel. Drugs and narcotics in history.(1996).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHickel, Erika. "Das Kaiserliche Gesundheitsamt (Imperial Health Office) and the Chemical Industry in Germany During the Second Empire: Partners or Adversaries? / Erika Hickel." Drugs and Narcotics in History.(1996) .
एमएलए (8वां संस्करण) प्रशस्ति पत्रHickel, Erika. "Das Kaiserliche Gesundheitsamt (Imperial Health Office) and the Chemical Industry in Germany During the Second Empire: Partners or Adversaries? / Erika Hickel." Drugs and Narcotics in History.(1996), .
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