Levine, H. (1985). Classifying immersions into R4 over stable maps of 3-manifolds into R2. Springer-Verlag.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLevine, Harold. Classifying Immersions into R4 over Stable Maps of 3-manifolds into R2. Berlín: Springer-Verlag, 1985.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLevine, Harold. Classifying Immersions into R4 over Stable Maps of 3-manifolds into R2. Springer-Verlag, 1985.
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