Christensen, H. M., & Calvert, W. E. (1944). Catgut sterilization: The basic principles of the spore-germinating method. Nyt nordisk forlag A. Busck.
Lua i Stíl Chicago (17ú heag.)Christensen, Henry Marinus, agus W. E. Calvert. Catgut Sterilization: The Basic Principles of the Spore-germinating Method. Copenhagen: Nyt nordisk forlag A. Busck, 1944.
Lua MLA (8ú heag.)Christensen, Henry Marinus, agus W. E. Calvert. Catgut Sterilization: The Basic Principles of the Spore-germinating Method. Nyt nordisk forlag A. Busck, 1944.
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