एपीए उद्धरण

Villalobos, C. R. (1973). Ptychophallus costaricensis, a new freshwater crab from Costa Rica.

शिकागो स्टाइल उद्धरण

Villalobos, Carlos R. Ptychophallus Costaricensis, a New Freshwater Crab From Costa Rica. 1973.

एमएलए उद्धरण

Villalobos, Carlos R. Ptychophallus Costaricensis, a New Freshwater Crab From Costa Rica. 1973.