Morgan, Clive I. (1977). "Population dynamics of two species of Tardigrada, Macrobiotus hufelandii (Schultze) and Echiniscus (Echiniscus) testudo (Doyere), in roof moss from Swansea". Journal of Animal Ecology. 46 (1): 263–79. doi:10.2307/3960. JSTOR3960.
Morgan, Clive I. (1977). "Population dynamics of two species of Tardigrada, Macrobiotus hufelandii (Schultze) and Echiniscus (Echiniscus) testudo (Doyere), in roof moss from Swansea". Journal of Animal Ecology. 46 (1): 263–79. doi:10.2307/3960. JSTOR3960.