Gaya APA

ASTM., . (1979). 1979 Annual Book Of ASTM Standards Part 19 : Natural building stones; soil and rock; peates, mosses, and humus. (1979). : Philadelphia : ASTM,.

Gaya MLA

ASTM., . "1979 Annual Book Of ASTM Standards Part 19 : Natural building stones; soil and rock; peates, mosses, and humus.". 1979 : Philadelphia : ASTM,, 1979. Text.