Dyfyniad APA

DONAHUE, R. L., & MILLER, R. W. (1990). SOILS: AN INTRODUCTION TO SOILS AND PLANT GROWTH (6.).

Dyfyniad Arddull Chicago

DONAHUE, ROY L., and RAYMOND W. MILLER. SOILS: AN INTRODUCTION TO SOILS AND PLANT GROWTH. 6. NEW DELHI, PRENTICE-HALL OF INDIA, 1990.

Dyfyniad MLA

DONAHUE, ROY L., and RAYMOND W. MILLER. SOILS: AN INTRODUCTION TO SOILS AND PLANT GROWTH. 6. 1990.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.