1. Tide Tables. West Coast of North and South America: 83 (1967).
2. Tide Tables. West Coast of North and South America: 172 (1967).
3. CUTRESS, B. M., BULLETIN OF MARINE SCIENCE 15: 797 (1965).
4. DEUTLER, F, ZOOLOGISCHE JAHRBUCHER. ABTEILUNG FUR SYSTEMATIK, GEOGRAPHIE UND BIOLOGIE DER TIERE 48: 119 (1926).
5. EBERT, T.A., A TECHNIQUE FOR THE INDIVIDUAL MARKING OF SEA-URCHINS, ECOLOGY 46: 193 (1965).