Ruiz, A. (1959). Notes on Costa Rican Opalinids. I. Opalina moreletei Metcalf.
शिकागो स्टाइल उद्धरणRuiz, Armando. Notes On Costa Rican Opalinids. I. Opalina Moreletei Metcalf. 1959.
एमएलए उद्धरणRuiz, Armando. Notes On Costa Rican Opalinids. I. Opalina Moreletei Metcalf. 1959.
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