Crum, H. A., & Steere, W. C. (1956). Puerto Rican Musci: New species and new combinations ; additional records of Hypnodon perpusillus ([Sonderdr.].).
Chicago Style (17th ed.) CitationCrum, Howard Alvin, and William Campbell Steere. Puerto Rican Musci: New Species and New Combinations ; Additional Records of Hypnodon Perpusillus. [Sonderdr.]. 1956.
MLA (9th ed.) CitationCrum, Howard Alvin, and William Campbell Steere. Puerto Rican Musci: New Species and New Combinations ; Additional Records of Hypnodon Perpusillus. [Sonderdr.]. 1956.
Warning: These citations may not always be 100% accurate.