Romero-Orozco, E., & Bertsch, H. (1984). Effects Of The Commercial Fishing Of`The Red Urchin, Strongylocentrotus Franciscanus (Echinodermata), On It's Population Structure In Santo Tomas, Baja California, Mexico, With a Comparison Of Sampling Methods. Iniversidad Autónoma de Baja California.

Romero-Orozco, E.J., and H. Bertsch. Effects Of The Commercial Fishing Of`The Red Urchin, Strongylocentrotus Franciscanus (Echinodermata), On It's Population Structure In Santo Tomas, Baja California, Mexico, With a Comparison Of Sampling Methods. Iniversidad Autónoma de Baja California, 1984.

Romero-Orozco, E.J., and H. Bertsch. Effects Of The Commercial Fishing Of`The Red Urchin, Strongylocentrotus Franciscanus (Echinodermata), On It's Population Structure In Santo Tomas, Baja California, Mexico, With a Comparison Of Sampling Methods. Iniversidad Autónoma de Baja California, 1984.