APA

AASHTO ISM-81, . (1981). Interim specifications and methods of sampling and testing adopted by the AASHTO subcommittee on materials 1981. Washington DC: AASHTO ISM-81.

Chicago

AASHTO ISM-81, . 1981. Interim specifications and methods of sampling and testing adopted by the AASHTO subcommittee on materials 1981. Washington DC: AASHTO ISM-81.

Harvard

AASHTO ISM-81, . (1981). Interim specifications and methods of sampling and testing adopted by the AASHTO subcommittee on materials 1981. Washington DC: AASHTO ISM-81.

MLA

AASHTO ISM-81, . Interim specifications and methods of sampling and testing adopted by the AASHTO subcommittee on materials 1981. Washington DC: AASHTO ISM-81. 1981.